diff --git a/dlls/gdiplus/tests/image.c b/dlls/gdiplus/tests/image.c
index de6fad093d5..b17323cb759 100644
--- a/dlls/gdiplus/tests/image.c
+++ b/dlls/gdiplus/tests/image.c
@@ -39,15 +39,21 @@ static GpStatus (WINGDIPAPI *pGdipInitializePalette)(ColorPalette*,PaletteType,I
 #define expect(expected, got) ok((got) == (expected), "Expected %d, got %d\n", (UINT)(expected), (UINT)(got))
 #define expectf(expected, got) ok(fabs((expected) - (got)) < 0.0001, "Expected %f, got %f\n", (expected), (got))
 
+static BOOL compare_uint(unsigned int x, unsigned int y, unsigned int max_diff)
+{
+    unsigned int diff = x > y ? x - y : y - x;
+    return diff <= max_diff;
+}
+
 static BOOL color_match(ARGB c1, ARGB c2, BYTE max_diff)
 {
-    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff) return FALSE;
+    if (!compare_uint(c1 & 0xff, c2 & 0xff, max_diff)) return FALSE;
     c1 >>= 8; c2 >>= 8;
-    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff) return FALSE;
+    if (!compare_uint(c1 & 0xff, c2 & 0xff, max_diff)) return FALSE;
     c1 >>= 8; c2 >>= 8;
-    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff) return FALSE;
+    if (!compare_uint(c1 & 0xff, c2 & 0xff, max_diff)) return FALSE;
     c1 >>= 8; c2 >>= 8;
-    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff) return FALSE;
+    if (!compare_uint(c1 & 0xff, c2 & 0xff, max_diff)) return FALSE;
     return TRUE;
 }