diff --git a/dlls/wined3d/shader.c b/dlls/wined3d/shader.c
index da82bd8556c..8c344bd5e8e 100644
--- a/dlls/wined3d/shader.c
+++ b/dlls/wined3d/shader.c
@@ -628,7 +628,7 @@ static HRESULT shader_get_registers_used(struct wined3d_shader *shader, const st
         else
         {
             BOOL color0_mov = FALSE;
-            int i, limit;
+            unsigned int i, limit;
 
             /* This will loop over all the registers and try to
              * make a bitmask of the ones we're interested in.