diff --git a/extra/cuda/memory/memory.factor b/extra/cuda/memory/memory.factor
index 9e856ad69b..b9bfd768d8 100644
--- a/extra/cuda/memory/memory.factor
+++ b/extra/cuda/memory/memory.factor
@@ -2,7 +2,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors alien alien.data alien.destructors assocs
 byte-arrays cuda.ffi cuda.utils destructors fry io.encodings.string
-io.encodings.utf8 kernel locals namespaces sequences strings ;
+io.encodings.utf8 kernel locals math namespaces sequences strings ;
 QUALIFIED-WITH: alien.c-types c
 IN: cuda.memory
 
@@ -12,7 +12,7 @@ IN: cuda.memory
     c:*int ; inline
 
 : cuda-malloc-type ( n type -- ptr )
-    heap-size * cuda-malloc ; inline
+    c:heap-size * cuda-malloc ; inline
 
 : cuda-free ( ptr -- )
     cuMemFree cuda-error ; inline