diff --git a/templates/config.m4.template b/templates/config.m4.template
index 5847d456f51..f5f1d23088d 100644
--- a/templates/config.m4.template
+++ b/templates/config.m4.template
@@ -7,9 +7,9 @@
     dnl Write more examples of tests here...
 
     dnl # --with-grpc -> add include path
-    PHP_ADD_INCLUDE(../../grpc/include)
-    PHP_ADD_INCLUDE(../../grpc/src/php/ext/grpc)
-    PHP_ADD_INCLUDE(../../grpc/third_party/boringssl/include)
+    PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/include)
+    PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/src/php/ext/grpc)
+    PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/boringssl/include)
 
     LIBS="-lpthread $LIBS"