diff --git a/include/pocketpy/pocketpy_c.h b/include/pocketpy/pocketpy_c.h
index e3d60f92..70d75555 100644
--- a/include/pocketpy/pocketpy_c.h
+++ b/include/pocketpy/pocketpy_c.h
@@ -65,7 +65,7 @@ PK_EXPORT bool pkpy_is_none(pkpy_vm*, int i);
 
 // special push
 PK_EXPORT bool pkpy_push_null(pkpy_vm*);
-PK_EXPORT bool pkpy_push_function(pkpy_vm*, const char* sig, pkpy_CFunction);
+PK_EXPORT bool pkpy_push_function(pkpy_vm*, const char* sig, pkpy_CFunction val);
 PK_EXPORT bool pkpy_push_module(pkpy_vm*, const char* name);
 
 // some opt
diff --git a/src2/pocketpy_c.c b/src2/pocketpy_c.c
index 7d37f2c6..97eb41ed 100644
--- a/src2/pocketpy_c.c
+++ b/src2/pocketpy_c.c
@@ -144,7 +144,7 @@ bool pkpy_push_null(pkpy_vm* vm) {
     return returnValue;
 }
 
-bool pkpy_push_function(pkpy_vm* vm, const char* sig, pkpy_CFunction) {
+bool pkpy_push_function(pkpy_vm* vm, const char* sig, pkpy_CFunction val) {
     bool returnValue;
     return returnValue;
 }