diff --git a/direct/src/heapq/heapq.cxx b/direct/src/heapq/heapq.cxx
index 51608e7b52..7a133e4ccc 100755
--- a/direct/src/heapq/heapq.cxx
+++ b/direct/src/heapq/heapq.cxx
@@ -18,9 +18,9 @@ static int _siftdown(PyObject *list, int startpos, int pos);
 static int _siftup(PyObject *list, int pos);
 
 #ifdef _WIN32
-extern __declspec(dllexport) void initlibheapq(void);
+extern "C" __declspec(dllexport) void initlibheapq(void);
 #else
-extern void initlibheapq();
+extern "C" void initlibheapq();
 #endif
 
 static PyObject *