diff --git a/MessageDisplayKit/Classes/Vendor/XHPathCover/XHPathCover.m b/MessageDisplayKit/Classes/Vendor/XHPathCover/XHPathCover.m
index e62ef61..090f30e 100644
--- a/MessageDisplayKit/Classes/Vendor/XHPathCover/XHPathCover.m
+++ b/MessageDisplayKit/Classes/Vendor/XHPathCover/XHPathCover.m
@@ -87,9 +87,9 @@ - (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintCo
             if (radius % 2 != 1) {
                 radius += 1; // force radius to be odd so that the three box-blur methodology works.
             }
-            vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
-            vImageBoxConvolve_ARGB8888(&effectOutBuffer, &effectInBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
-            vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
+            vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, (unsigned int)radius, (unsigned int)radius, 0, kvImageEdgeExtend);
+            vImageBoxConvolve_ARGB8888(&effectOutBuffer, &effectInBuffer, NULL, 0, 0, (unsigned int)radius, (unsigned int)radius, 0, kvImageEdgeExtend);
+            vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, (unsigned int)radius, (unsigned int)radius, 0, kvImageEdgeExtend);
         }
         BOOL effectImageBuffersAreSwapped = NO;
         if (hasSaturationChange) {