diff --git a/include/bx/inline/simd128_langext.inl b/include/bx/inline/simd128_langext.inl
index 0f6fa03..457b108 100644
--- a/include/bx/inline/simd128_langext.inl
+++ b/include/bx/inline/simd128_langext.inl
@@ -9,7 +9,7 @@
 
 namespace bx
 {
-	float sqrt(float);
+	BX_CONST_FUNC float sqrt(float);
 
 #define ELEMx 0
 #define ELEMy 1
diff --git a/include/bx/inline/simd128_ref.inl b/include/bx/inline/simd128_ref.inl
index 2a47cea..6895b24 100644
--- a/include/bx/inline/simd128_ref.inl
+++ b/include/bx/inline/simd128_ref.inl
@@ -9,8 +9,8 @@
 
 namespace bx
 {
-	float sqrt(float);
-	float rsqrt(float);
+	BX_CONST_FUNC float sqrt(float);
+	BX_CONST_FUNC float rsqrt(float);
 
 #define ELEMx 0
 #define ELEMy 1