diff --git a/tests/PictureTest.cpp b/tests/PictureTest.cpp
index 26b1f56..da8d13a 100644
--- a/tests/PictureTest.cpp
+++ b/tests/PictureTest.cpp
@@ -133,7 +133,7 @@
                 uint32_t index = SkGetPackedR32(pmc);
                 SkASSERT(SkGetPackedG32(pmc) == index);
                 SkASSERT(SkGetPackedB32(pmc) == index);
-                SkASSERT(index < count);
+                SkASSERT(static_cast<int>(index) < count);
                 bitarray |= 1 << index;
             }
         }