diff --git a/spine-c/spine-c/src/spine/SkeletonBinary.c b/spine-c/spine-c/src/spine/SkeletonBinary.c
index 50c7f3690..406c7f389 100644
--- a/spine-c/spine-c/src/spine/SkeletonBinary.c
+++ b/spine-c/spine-c/src/spine/SkeletonBinary.c
@@ -128,7 +128,8 @@ static int readVarint(_dataInput *input, int /*bool*/ optimizePositive) {
 			}
 		}
 	}
-	if (!optimizePositive) value = (((unsigned int) value >> 1) ^ -(value & 1));
+	if (!optimizePositive)
+        value = ((unsigned int) value >> 1) ^ (~(value & 1));
 	return (int) value;
 }