diff --git a/res/res_musiconhold.c b/res/res_musiconhold.c
index bce86a8e73..f905b8aa66 100644
--- a/res/res_musiconhold.c
+++ b/res/res_musiconhold.c
@@ -1277,6 +1277,8 @@ static struct mohclass *_moh_class_malloc(const char *file, int line, const char
 #endif
 		)) {
 		class->format = AST_FORMAT_SLINEAR;
+		class->srcfd = -1;
+		class->pseudofd = -1;
 	}
 
 	return class;