diff --git a/glm/core/func_integer.inl b/glm/core/func_integer.inl
index 3e4d56c8..bf6ac2e4 100644
--- a/glm/core/func_integer.inl
+++ b/glm/core/func_integer.inl
@@ -267,7 +267,7 @@ namespace glm
 		)
 		{
 			GLM_STATIC_ASSERT(std::numeric_limits<genIUType>::is_integer, "'bitfieldExtract' only accept integer values");
-			assert(Offset + Bits <= sizeof(genIUType));
+			assert(Offset + Bits <= (sizeof(genIUType) << 3));
 
 			genIUType Result(0);
 			if(std::numeric_limits<genIUType>::is_signed)