diff --git a/include/xo/interpreter2/VsmPrimitives.hpp b/include/xo/interpreter2/VsmPrimitives.hpp
index 59f52fc3..9690d03e 100644
--- a/include/xo/interpreter2/VsmPrimitives.hpp
+++ b/include/xo/interpreter2/VsmPrimitives.hpp
@@ -18,7 +18,8 @@ namespace xo {
 
         public:
             /** create primitive: report memory use to console **/
-            static DPrimitive_gco_0 * make_report_memory_use_pm(obj<AAllocator> mm);
+            static DPrimitive_gco_0 * make_report_memory_use_pm(obj<AAllocator> mm,
+                                                                StringTable * stbl);
         };
 
     } /*namespace scm*/
diff --git a/src/interpreter2/VsmPrimitives.cpp b/src/interpreter2/VsmPrimitives.cpp
index a3eb79e0..e725c241 100644
--- a/src/interpreter2/VsmPrimitives.cpp
+++ b/src/interpreter2/VsmPrimitives.cpp
@@ -6,6 +6,8 @@
 #include "VsmPrimitives.hpp"
 #include <xo/numeric/NumericDispatch.hpp>
 #include <xo/object2/Boolean.hpp>
+#include <xo/type/AtomicType.hpp>
+#include <xo/type/FunctionType.hpp>
 
 namespace xo {
     //using xo::scm::NumericDispatch;
@@ -38,10 +40,18 @@ namespace xo {
         }
 
         DPrimitive_gco_0 *
-        VsmPrimitives::make_report_memory_use_pm(obj<AAllocator> mm)
+        VsmPrimitives::make_report_memory_use_pm(obj<AAllocator> mm,
+                                                 StringTable * stbl)
         {
+            (void)stbl;
+
+            auto bool_ty = DAtomicType::make(mm, Metatype::t_bool());
+            // report_memory_use: () -> bool
+            auto pm_ty = obj<AType,DFunctionType>(DFunctionType::_make(mm, bool_ty));
+
             return DPrimitive_gco_0::_make(mm,
                                            "report_memory_use",
+                                           pm_ty,
                                            &xfer_report_memory_use);
         }
 
diff --git a/src/interpreter2/interpreter2_register_primitives.cpp b/src/interpreter2/interpreter2_register_primitives.cpp
index 9b165b17..f0da9a8e 100644
--- a/src/interpreter2/interpreter2_register_primitives.cpp
+++ b/src/interpreter2/interpreter2_register_primitives.cpp
@@ -56,13 +56,11 @@ namespace xo {
                                          InstallSink sink,
                                          InstallFlags flags)
         {
-            (void)stbl;
-
             scope log(XO_DEBUG(true));
 
             bool ok = true;
 
-            ok = ok & install_aux(sink, VsmPrimitives::make_report_memory_use_pm(mm), flags);
+            ok = ok & install_aux(sink, VsmPrimitives::make_report_memory_use_pm(mm, stbl), flags);
 
             return ok;
         }