diff --git a/eeschema/class_libentry.cpp b/eeschema/class_libentry.cpp
index 70fc90c1bc..9ffe3f3e83 100644
--- a/eeschema/class_libentry.cpp
+++ b/eeschema/class_libentry.cpp
@@ -1697,7 +1697,7 @@ LIB_ALIAS* LIB_PART::RemoveAlias( LIB_ALIAS* aAlias )
         bool rename = aAlias->IsRoot();
 
         wxLogTrace( traceSchLibMem,
-                    wxT( "%s: part:'%s', alias:'%s', alias count %llu, reference count %d." ),
+                    wxT( "%s: part:'%s', alias:'%s', alias count %llu, reference count %ld." ),
                     GetChars( wxString::FromAscii( __WXFUNCTION__ ) ),
                     GetChars( m_name ),
                     GetChars( aAlias->GetName() ),
diff --git a/eeschema/sch_component.cpp b/eeschema/sch_component.cpp
index bf9dc92808..90a494f8b3 100644
--- a/eeschema/sch_component.cpp
+++ b/eeschema/sch_component.cpp
@@ -414,7 +414,7 @@ wxString SCH_COMPONENT::GetPath( const SCH_SHEET_PATH* sheet ) const
 
     wxString str;
 
-    str.Printf( wxT( "%8.8lX" ), m_TimeStamp );
+    str.Printf( wxT( "%8.8lX" ), (long unsigned) m_TimeStamp );
     return sheet->Path() + str;
 }
 
@@ -547,8 +547,8 @@ void SCH_COMPONENT::SetTimeStamp( time_t aNewTimeStamp )
 {
     wxString string_timestamp, string_oldtimestamp;
 
-    string_timestamp.Printf( wxT( "%08lX" ), aNewTimeStamp );
-    string_oldtimestamp.Printf( wxT( "%08lX" ), m_TimeStamp );
+    string_timestamp.Printf( wxT( "%08lX" ), (long unsigned) aNewTimeStamp );
+    string_oldtimestamp.Printf( wxT( "%08lX" ), (long unsigned) m_TimeStamp );
     EDA_ITEM::SetTimeStamp( aNewTimeStamp );
 
     for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )