diff --git a/Callback/Callback.xs b/Callback/Callback.xs
index 6f0cbd5..5fef532 100644
--- a/Callback/Callback.xs
+++ b/Callback/Callback.xs
@@ -319,7 +319,7 @@ while (importDescriptor->Name != 0){
 #endif
     if(TargetDllNameLen == 0) goto NO_MORE_LIBS;
     if(TargetDllNameLen == DllNameLen
-        && strnicmp(TargetDllNameStr, DllNameStr, TargetDllNameLen) == 0
+        && strncasecmp(TargetDllNameStr, DllNameStr, TargetDllNameLen) == 0
         && importDescriptor->OriginalFirstThunk
         && importDescriptor->FirstThunk
     ){