diff --git a/src/if_python3.c b/src/if_python3.c
index e1fc5c7..a6a655f 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -828,7 +828,7 @@
     --recurse;
 }
 
-#if (defined(DYNAMIC_PYTHON) && defined(FEAT_PYTHON)) || defined(PROTO)
+#if (defined(DYNAMIC_PYTHON3) && defined(DYNAMIC_PYTHON) && defined(FEAT_PYTHON) && defined(UNIX)) || defined(PROTO)
     int
 python3_loaded()
 {