diff --git a/modules/src/idf/idf_pkg.body b/modules/src/idf/idf_pkg.body
index 8f970aef7..5d1260d75 100644
--- a/modules/src/idf/idf_pkg.body
+++ b/modules/src/idf/idf_pkg.body
@@ -123,7 +123,7 @@ struct idf* str2idf(char tg[], int cpy)
 	int size;
 
 	IDF_STARTHASH(hash);
-	while (c = *cp++)
+	while ((c = *cp++))
 	{
 		IDF_ENHASH(hash, c);
 	}