diff --git a/src/_imagingft.c b/src/_imagingft.c
index da03e3ba9..f8143e0cc 100644
--- a/src/_imagingft.c
+++ b/src/_imagingft.c
@@ -1243,7 +1243,7 @@ font_getvarnames(FontObject *self) {
         return PyErr_NoMemory();
     }
 
-    for (int i = 0; i < num_namedstyles; i++) {
+    for (unsigned int i = 0; i < num_namedstyles; i++) {
         list_names_filled[i] = 0;
     }