diff --git a/extra/gml/viewer/viewer.factor b/extra/gml/viewer/viewer.factor
index ae60709998..73cfe7bf37 100644
--- a/extra/gml/viewer/viewer.factor
+++ b/extra/gml/viewer/viewer.factor
@@ -8,9 +8,10 @@ math.order math.ranges math.vectors math.vectors.conversion
 math.vectors.simd math.vectors.simd.cords method-chains models
 namespaces sequences sets specialized-vectors typed ui
 ui.gadgets ui.gadgets.worlds ui.gestures ui.pixel-formats
-vectors ;
+vectors specialized-arrays ;
 FROM: math.matrices => m.v ;
 FROM: models => change-model ;
+SPECIALIZED-ARRAY: ushort
 SPECIALIZED-VECTORS: ushort float-4 ;
 IN: gml.viewer
 
diff --git a/extra/gpu/render/render.factor b/extra/gpu/render/render.factor
index 390271119c..a63dd54101 100755
--- a/extra/gpu/render/render.factor
+++ b/extra/gpu/render/render.factor
@@ -169,13 +169,13 @@ M: index-elements render-vertex-indexes-instanced
     [ ] tri*
     swap index-buffer [ swap glDrawElementsInstanced ] with-gpu-data-ptr ;
 
-M: specialized-array render-vertex-indexes
+M: specialized-array-mixin render-vertex-indexes
     GL_ELEMENT_ARRAY_BUFFER 0 glBindBuffer
     [ gl-primitive-mode ]
     [ [ length ] [ gl-array-element-type ] [ >c-ptr ] tri ] bi*
     glDrawElements ;
 
-M: specialized-array render-vertex-indexes-instanced
+M: specialized-array-mixin render-vertex-indexes-instanced
     GL_ELEMENT_ARRAY_BUFFER 0 glBindBuffer
     [ gl-primitive-mode ]
     [ [ length ] [ gl-array-element-type ] [ >c-ptr ] tri ]
@@ -258,7 +258,7 @@ DEFER: uniform-texture-accessors
     \ nip swap \ cleave [ ] 3sequence ;
 
 UNION: binary-data
-    c-ptr specialized-array struct simd-128 ;
+    c-ptr specialized-array-mixin struct simd-128 ;
 
 GENERIC: >uniform-bool-array ( sequence -- c-array )
 GENERIC: >uniform-int-array ( sequence -- c-array )