diff --git a/Makefile b/Makefile
index 64474fd..701c2d8 100644
--- a/Makefile
+++ b/Makefile
@@ -1094,6 +1094,8 @@
     src/core/httpcli/httpcli.c \
     src/core/httpcli/httpcli_security_context.c \
     src/core/httpcli/parser.c \
+    src/core/iomgr/alarm.c \
+    src/core/iomgr/alarm_heap.c \
     src/core/iomgr/endpoint.c \
     src/core/iomgr/endpoint_pair_posix.c \
     src/core/iomgr/iomgr_libevent.c \
@@ -2229,6 +2231,8 @@
     src/core/httpcli/httpcli.c \
     src/core/httpcli/httpcli_security_context.c \
     src/core/httpcli/parser.c \
+    src/core/iomgr/alarm.c \
+    src/core/iomgr/alarm_heap.c \
     src/core/iomgr/endpoint.c \
     src/core/iomgr/endpoint_pair_posix.c \
     src/core/iomgr/iomgr_libevent.c \