diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index 147fa1ea49e..c645b2638a3 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -122,7 +122,7 @@ aub_dump_bmp(struct gl_context *ctx)
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
 
-   for (int i = 0; i < fb->_NumColorDrawBuffers; i++) {
+   for (unsigned i = 0; i < fb->_NumColorDrawBuffers; i++) {
       struct intel_renderbuffer *irb =
 	 intel_renderbuffer(fb->_ColorDrawBuffers[i]);