diff --git a/src/php/ext/grpc/byte_buffer.c b/src/php/ext/grpc/byte_buffer.c
index 9f122d6..4f3e6b6 100644
--- a/src/php/ext/grpc/byte_buffer.c
+++ b/src/php/ext/grpc/byte_buffer.c
@@ -35,18 +35,18 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
 #include <string.h>
 
 #include "byte_buffer.h"
 
-#include "grpc/grpc.h"
-#include "grpc/support/slice.h"
+#include <grpc/grpc.h>
+#include <grpc/support/slice.h>
 
 grpc_byte_buffer *string_to_byte_buffer(char *string, size_t length) {
   gpr_slice slice = gpr_slice_from_copied_buffer(string, length);
diff --git a/src/php/ext/grpc/byte_buffer.h b/src/php/ext/grpc/byte_buffer.h
index 7a406385..0e9d1e7 100644
--- a/src/php/ext/grpc/byte_buffer.h
+++ b/src/php/ext/grpc/byte_buffer.h
@@ -34,7 +34,7 @@
 #ifndef NET_GRPC_PHP_GRPC_BYTE_BUFFER_H_
 #define NET_GRPC_PHP_GRPC_BYTE_BUFFER_H_
 
-#include "grpc/grpc.h"
+#include <grpc/grpc.h>
 
 grpc_byte_buffer *string_to_byte_buffer(char *string, size_t length);
 
diff --git a/src/php/ext/grpc/call.c b/src/php/ext/grpc/call.c
index ba1b2a4..6e83e79 100644
--- a/src/php/ext/grpc/call.c
+++ b/src/php/ext/grpc/call.c
@@ -37,20 +37,20 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
-#include "zend_hash.h"
+#include <zend_exceptions.h>
+#include <zend_hash.h>
 
 #include <stdbool.h>
 
-#include "grpc/support/log.h"
-#include "grpc/support/alloc.h"
-#include "grpc/grpc.h"
+#include <grpc/support/log.h>
+#include <grpc/support/alloc.h>
+#include <grpc/grpc.h>
 
 #include "timeval.h"
 #include "channel.h"
diff --git a/src/php/ext/grpc/call.h b/src/php/ext/grpc/call.h
index 743effe..e7eb9a7 100644
--- a/src/php/ext/grpc/call.h
+++ b/src/php/ext/grpc/call.h
@@ -38,12 +38,12 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
-#include "grpc/grpc.h"
+#include <grpc/grpc.h>
 
 /* Class entry for the Call PHP class */
 extern zend_class_entry *grpc_ce_call;
diff --git a/src/php/ext/grpc/channel.c b/src/php/ext/grpc/channel.c
index c96fb12..51a3eae 100644
--- a/src/php/ext/grpc/channel.c
+++ b/src/php/ext/grpc/channel.c
@@ -37,19 +37,19 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
+#include <zend_exceptions.h>
 
 #include <stdbool.h>
 
-#include "grpc/grpc.h"
-#include "grpc/support/log.h"
-#include "grpc/grpc_security.h"
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <grpc/grpc_security.h>
 
 #include "server.h"
 #include "credentials.h"
diff --git a/src/php/ext/grpc/channel.h b/src/php/ext/grpc/channel.h
index 2c79668..c13fa4c 100755
--- a/src/php/ext/grpc/channel.h
+++ b/src/php/ext/grpc/channel.h
@@ -38,12 +38,12 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
-#include "grpc/grpc.h"
+#include <grpc/grpc.h>
 
 /* Class entry for the PHP Channel class */
 extern zend_class_entry *grpc_ce_channel;
diff --git a/src/php/ext/grpc/credentials.c b/src/php/ext/grpc/credentials.c
index a94b0ea..a262b99 100644
--- a/src/php/ext/grpc/credentials.c
+++ b/src/php/ext/grpc/credentials.c
@@ -37,17 +37,17 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
-#include "zend_hash.h"
+#include <zend_exceptions.h>
+#include <zend_hash.h>
 
-#include "grpc/grpc.h"
-#include "grpc/grpc_security.h"
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
 
 zend_class_entry *grpc_ce_credentials;
 
diff --git a/src/php/ext/grpc/php_grpc.c b/src/php/ext/grpc/php_grpc.c
index 1f9edfe..3e669ec 100644
--- a/src/php/ext/grpc/php_grpc.c
+++ b/src/php/ext/grpc/php_grpc.c
@@ -42,9 +42,9 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
 // ZEND_DECLARE_MODULE_GLOBALS(grpc)
diff --git a/src/php/ext/grpc/server.c b/src/php/ext/grpc/server.c
index 86b2995..46fe745 100644
--- a/src/php/ext/grpc/server.c
+++ b/src/php/ext/grpc/server.c
@@ -37,19 +37,19 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
+#include <zend_exceptions.h>
 
 #include <stdbool.h>
 
-#include "grpc/grpc.h"
-#include "grpc/support/log.h"
-#include "grpc/grpc_security.h"
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <grpc/grpc_security.h>
 
 #include "server.h"
 #include "channel.h"
diff --git a/src/php/ext/grpc/server.h b/src/php/ext/grpc/server.h
index ebb8d25..a2ee2ff 100755
--- a/src/php/ext/grpc/server.h
+++ b/src/php/ext/grpc/server.h
@@ -38,12 +38,12 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
-#include "grpc/grpc.h"
+#include <grpc/grpc.h>
 
 /* Class entry for the Server PHP class */
 extern zend_class_entry *grpc_ce_server;
diff --git a/src/php/ext/grpc/server_credentials.c b/src/php/ext/grpc/server_credentials.c
index df64e65..c4c1fab 100644
--- a/src/php/ext/grpc/server_credentials.c
+++ b/src/php/ext/grpc/server_credentials.c
@@ -37,17 +37,17 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
-#include "zend_hash.h"
+#include <zend_exceptions.h>
+#include <zend_hash.h>
 
-#include "grpc/grpc.h"
-#include "grpc/grpc_security.h"
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
 
 zend_class_entry *grpc_ce_server_credentials;
 
diff --git a/src/php/ext/grpc/server_credentials.h b/src/php/ext/grpc/server_credentials.h
index 8ed3697..7101d65 100755
--- a/src/php/ext/grpc/server_credentials.h
+++ b/src/php/ext/grpc/server_credentials.h
@@ -38,13 +38,13 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
-#include "grpc/grpc.h"
-#include "grpc/grpc_security.h"
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
 
 /* Class entry for the Server_Credentials PHP class */
 extern zend_class_entry *grpc_ce_server_credentials;
diff --git a/src/php/ext/grpc/timeval.c b/src/php/ext/grpc/timeval.c
index f90f006..1c9542d 100644
--- a/src/php/ext/grpc/timeval.c
+++ b/src/php/ext/grpc/timeval.c
@@ -37,18 +37,18 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
-#include "ext/spl/spl_exceptions.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
+#include <ext/spl/spl_exceptions.h>
 #include "php_grpc.h"
 
-#include "zend_exceptions.h"
+#include <zend_exceptions.h>
 
 #include <stdbool.h>
 
-#include "grpc/grpc.h"
-#include "grpc/support/time.h"
+#include <grpc/grpc.h>
+#include <grpc/support/time.h>
 
 zend_class_entry *grpc_ce_timeval;
 
diff --git a/src/php/ext/grpc/timeval.h b/src/php/ext/grpc/timeval.h
index e3183f6..07cef03 100755
--- a/src/php/ext/grpc/timeval.h
+++ b/src/php/ext/grpc/timeval.h
@@ -38,13 +38,13 @@
 #include "config.h"
 #endif
 
-#include "php.h"
-#include "php_ini.h"
-#include "ext/standard/info.h"
+#include <php.h>
+#include <php_ini.h>
+#include <ext/standard/info.h>
 #include "php_grpc.h"
 
-#include "grpc/grpc.h"
-#include "grpc/support/time.h"
+#include <grpc/grpc.h>
+#include <grpc/support/time.h>
 
 /* Class entry for the Timeval PHP Class */
 extern zend_class_entry *grpc_ce_timeval;