diff --git a/src/BulletCollision/Gimpact/btGImpactBvh.cpp b/src/BulletCollision/Gimpact/btGImpactBvh.cpp
index 3dce9f942..38fed6b4f 100644
--- a/src/BulletCollision/Gimpact/btGImpactBvh.cpp
+++ b/src/BulletCollision/Gimpact/btGImpactBvh.cpp
@@ -150,8 +150,7 @@ int btBvhTree::_sort_and_calc_splitting_index(
 		splitIndex = startIndex+ (numIndices>>1);
 	}
 
-	bool unbal = (splitIndex==startIndex) || (splitIndex == (endIndex));
-	btAssert(!unbal);
+	btAssert(!((splitIndex==startIndex) || (splitIndex == (endIndex))));
 
 	return splitIndex;
 
diff --git a/src/BulletCollision/Gimpact/btGImpactQuantizedBvh.cpp b/src/BulletCollision/Gimpact/btGImpactQuantizedBvh.cpp
index 553f7ba13..ea1647a81 100644
--- a/src/BulletCollision/Gimpact/btGImpactQuantizedBvh.cpp
+++ b/src/BulletCollision/Gimpact/btGImpactQuantizedBvh.cpp
@@ -171,8 +171,7 @@ int btQuantizedBvhTree::_sort_and_calc_splitting_index(
 		splitIndex = startIndex+ (numIndices>>1);
 	}
 
-	bool unbal = (splitIndex==startIndex) || (splitIndex == (endIndex));
-	btAssert(!unbal);
+	btAssert(!((splitIndex==startIndex) || (splitIndex == (endIndex))));
 
 	return splitIndex;
 
diff --git a/src/BulletCollision/Gimpact/gim_box_set.cpp b/src/BulletCollision/Gimpact/gim_box_set.cpp
index 79e77a5d9..0c3d7ba8d 100644
--- a/src/BulletCollision/Gimpact/gim_box_set.cpp
+++ b/src/BulletCollision/Gimpact/gim_box_set.cpp
@@ -110,7 +110,7 @@ GUINT GIM_BOX_TREE::_sort_and_calc_splitting_index(
 		splitIndex = startIndex+ (numIndices>>1);
 	}
 
-	btAssert(!(splitIndex==startIndex) || (splitIndex == (endIndex)));
+	btAssert(!((splitIndex==startIndex) || (splitIndex == (endIndex))));
 
 	return splitIndex;
 }