diff --git a/src/MIDebugEngine/Natvis.Impl/NatvisNames.cs b/src/MIDebugEngine/Natvis.Impl/NatvisNames.cs
index 85972bdd8..ad8df5021 100644
--- a/src/MIDebugEngine/Natvis.Impl/NatvisNames.cs
+++ b/src/MIDebugEngine/Natvis.Impl/NatvisNames.cs
@@ -34,7 +34,7 @@ private void SetArraySize(int[] Dims)
         }
 
         private static Regex s_identifier = new Regex("^[a-zA-Z$_][a-zA-Z$_0-9]*");
-        private static Regex s_numeric = new Regex("^[0-9]+(u|l|ul)*");        // only decimal constants
+        private static Regex s_numeric = new Regex("^[-]?[0-9]+(u|l|ul)*");        // only decimal constants
         private static Regex s_simpleType = new Regex(
                     @"^(signed\s+char|unsigned\s+char|char16_t|char32_t|wchar_t|char|"
                     + @"signed\s+short\s+int|signed\s+short|unsigned\s+short\s+int|unsigned\s+short|short\s+int|short|"