diff --git a/engine/src/core-data/Common/MatDefs/Shadow/PostShadowPSSM15.frag b/engine/src/core-data/Common/MatDefs/Shadow/PostShadowPSSM15.frag
index 255900738..1c2cfb16d 100644
--- a/engine/src/core-data/Common/MatDefs/Shadow/PostShadowPSSM15.frag
+++ b/engine/src/core-data/Common/MatDefs/Shadow/PostShadowPSSM15.frag
@@ -1,4 +1,5 @@
 #extension GL_ARB_texture_gather : enable
+#extension GL_ARB_gpu_shader5 : enable
 
 #ifdef HARDWARE_SHADOWS
     #define SHADOWMAP sampler2DShadow