Removing more build errors
diff --git a/src/core/lib/iomgr/call_combiner.cc b/src/core/lib/iomgr/call_combiner.cc
index 48d8eae..bab3df0 100644
--- a/src/core/lib/iomgr/call_combiner.cc
+++ b/src/core/lib/iomgr/call_combiner.cc
@@ -18,6 +18,8 @@
 
 #include "src/core/lib/iomgr/call_combiner.h"
 
+#include <inttypes.h>
+
 #include <grpc/support/log.h>
 
 grpc_tracer_flag grpc_call_combiner_trace =