diff --git a/src/proc/asset.cpp b/src/proc/asset.cpp
index 531566b63..8b8865c65 100644
--- a/src/proc/asset.cpp
+++ b/src/proc/asset.cpp
@@ -66,12 +66,12 @@ namespace asset {
     , id(AssetManager::reg (this, idi))
     , enabled(true)
     {
-      TRACE (assetmem, "ctor Asset(id=%lu) :  adr=%p %s", size_t(id), this, cStr(this->ident) );
+      TRACE (assetmem, "ctor Asset(id=%zu) :  adr=%p %s", size_t(id), this, cStr(this->ident) );
     }
   
   Asset::~Asset ()
     { 
-      TRACE (assetmem, "dtor Asset(id=%lu) :  adr=%p", size_t(id), this );
+      TRACE (assetmem, "dtor Asset(id=%zu) :  adr=%p", size_t(id), this );
     }
   
 
diff --git a/src/proc/mobject/session/scope-path.cpp b/src/proc/mobject/session/scope-path.cpp
index badf0b1db..f48054802 100644
--- a/src/proc/mobject/session/scope-path.cpp
+++ b/src/proc/mobject/session/scope-path.cpp
@@ -134,7 +134,7 @@ namespace session {
   
   ScopePath::~ScopePath()
   {
-    WARN_IF (refcount_, session, "Destroying a scope path frame with ref-count=%lu", refcount_);
+    WARN_IF (refcount_, session, "Destroying a scope path frame with ref-count=%zu", refcount_);
   }
   
   
diff --git a/tests/lib/meta/generator-test.cpp b/tests/lib/meta/generator-test.cpp
index 00a816c22..9e1583ed2 100644
--- a/tests/lib/meta/generator-test.cpp
+++ b/tests/lib/meta/generator-test.cpp
@@ -134,7 +134,7 @@ namespace test {
           subInterface.eat (b13);
           me_can_has_more_numberz.eat();
           
-          INFO (test, "SizeOf = %lu", sizeof(me_can_has_more_numberz));
+          INFO (test, "SizeOf = %zu", sizeof(me_can_has_more_numberz));
         }
     };
   
diff --git a/tests/lib/scoped-holder-test.cpp b/tests/lib/scoped-holder-test.cpp
index dd0734bb7..40b2637e7 100644
--- a/tests/lib/scoped-holder-test.cpp
+++ b/tests/lib/scoped-holder-test.cpp
@@ -108,8 +108,8 @@ namespace test{
             
             TRACE (test, "holder at %p", &holder);
             TRACE (test, "object at %p", holder.get() );
-            TRACE (test, "size(object) = %lu", sizeof(*holder));
-            TRACE (test, "size(holder) = %lu", sizeof(holder));
+            TRACE (test, "size(object) = %zu", sizeof(*holder));
+            TRACE (test, "size(holder) = %zu", sizeof(holder));
           }
           CHECK (0 == Dummy::checksum());
         }