diff --git a/dlls/iphlpapi/iphlpapi_main.c b/dlls/iphlpapi/iphlpapi_main.c
index 430a943e400..a2ec4b2f60d 100644
--- a/dlls/iphlpapi/iphlpapi_main.c
+++ b/dlls/iphlpapi/iphlpapi_main.c
@@ -632,7 +632,7 @@ DWORD WINAPI FlushIpNetTable(DWORD dwIfIndex)
 DWORD WINAPI GetAdapterIndex(LPWSTR AdapterName, PULONG IfIndex)
 {
   char adapterName[MAX_ADAPTER_NAME];
-  int i;
+  unsigned int i;
   DWORD ret;
 
   TRACE("(AdapterName %p, IfIndex %p)\n", AdapterName, IfIndex);