diff --git a/src/common/filefn.cpp b/src/common/filefn.cpp
index 5355dd7e09..4a14615b78 100644
--- a/src/common/filefn.cpp
+++ b/src/common/filefn.cpp
@@ -1968,7 +1968,7 @@ wxFileKind wxGetFileKind(FILE *fp)
     (void)fp;
     return wxFILE_KIND_DISK;
 #else
-    return wxGetFileKind(fileno(fp));
+    return fp ? wxGetFileKind(fileno(fp)) : wxFILE_KIND_UNKNOWN;
 #endif
 }