1 files changed, 3 insertions, 1 deletions
diff --git a/source/slang/diagnostics.h b/source/slang/diagnostics.h
index 4c66ba51e..8e5bbcb64 100644
--- a/source/slang/diagnostics.h
+++ b/source/slang/diagnostics.h
@@ -69,9 +69,10 @@ namespace Slang
 
     class Name;
     class Decl;
+    struct QualType;
     class Type;
     struct TypeExp;
-    struct QualType;
+    class Val;
 
     enum class CodeGenTarget;
     enum class Stage : SlangStage;
@@ -92,6 +93,7 @@ namespace Slang
     void printDiagnosticArg(StringBuilder& sb, CodeGenTarget val);
     void printDiagnosticArg(StringBuilder& sb, Stage val);
     void printDiagnosticArg(StringBuilder& sb, ProfileVersion val);
+    void printDiagnosticArg(StringBuilder& sb, Val* val);
 
     template<typename T>
     void printDiagnosticArg(StringBuilder& sb, RefPtr<T> ptr)