diff --git a/gcc-c-api/gcc-callgraph.c b/gcc-c-api/gcc-callgraph.c
index aa05a53d..e9feb961 100644
--- a/gcc-c-api/gcc-callgraph.c
+++ b/gcc-c-api/gcc-callgraph.c
@@ -26,6 +26,8 @@
 #if (GCC_VERSION >= 5000)
 #include "gimple-expr.h"
 #endif
+#include "internal-fn.h"
+#include "gimple-expr.h"
 #include "gimple.h"
 
 /***********************************************************