diff --git a/libraries/gpu/src/gpu/Config.slh b/libraries/gpu/src/gpu/Config.slh
index a16ee372ae..76be161822 100644
--- a/libraries/gpu/src/gpu/Config.slh
+++ b/libraries/gpu/src/gpu/Config.slh
@@ -18,12 +18,13 @@
 <@elif GLPROFILE == MAC_GL @>
     <@def GPU_FEATURE_PROFILE GPU_LEGACY@>
     <@def GPU_TRANSFORM_PROFILE GPU_LEGACY@>
-    <@def VERSION_HEADER #version 120
+    <@def VERSION_HEADER #version 120
 #extension GL_EXT_gpu_shader4 : enable@>
 <@else@>
     <@def GPU_FEATURE_PROFILE GPU_LEGACY@>
     <@def GPU_TRANSFORM_PROFILE GPU_LEGACY@>
-    <@def VERSION_HEADER #version 120@>
+    <@def VERSION_HEADER #version 120
+#extension GL_EXT_gpu_shader4 : enable@>
 <@endif@>
 
 <@endif@>
diff --git a/libraries/gpu/src/gpu/GLBackend.cpp b/libraries/gpu/src/gpu/GLBackend.cpp
index b7b2744c31..bb855c46d4 100644
--- a/libraries/gpu/src/gpu/GLBackend.cpp
+++ b/libraries/gpu/src/gpu/GLBackend.cpp
@@ -202,7 +202,7 @@ void GLBackend::do_drawInstanced(Batch& batch, uint32 paramOffset) {
     uint32 startVertex = batch._params[paramOffset + 1]._uint;
     uint32 startInstance = batch._params[paramOffset + 0]._uint;
 
-    glDrawArraysInstanced(mode, startVertex, numVertices, numInstances);
+    glDrawArraysInstancedARB(mode, startVertex, numVertices, numInstances);
     (void) CHECK_GL_ERROR();
 }