diff --git a/src/coreclr/inc/CrstTypes.def b/src/coreclr/inc/CrstTypes.def
index dbf3363a07cfa..185a590d938e5 100644
--- a/src/coreclr/inc/CrstTypes.def
+++ b/src/coreclr/inc/CrstTypes.def
@@ -86,7 +86,7 @@ Crst ArgBasedStubCache
 End
 
 Crst AssemblyLoader
-    AcquiredBefore DeadlockDetection UniqueStack
+    AcquiredBefore DeadlockDetection UniqueStack DebuggerMutex
 End
 
 Crst AvailableClass
diff --git a/src/coreclr/inc/crsttypes.h b/src/coreclr/inc/crsttypes.h
index 071d767f9ec7d..a1bab2ecb906c 100644
--- a/src/coreclr/inc/crsttypes.h
+++ b/src/coreclr/inc/crsttypes.h
@@ -149,7 +149,7 @@ int g_rgCrstLevelMap[] =
     14,         // CrstAppDomainHandleTable
     0,          // CrstArgBasedStubCache
     0,          // CrstAssemblyList
-    7,          // CrstAssemblyLoader
+    12,         // CrstAssemblyLoader
     3,          // CrstAvailableClass
     4,          // CrstAvailableParamTypes
     7,          // CrstBaseDomain
diff --git a/src/coreclr/vm/nativeimage.cpp b/src/coreclr/vm/nativeimage.cpp
index 0255a29085002..9067273ed2ec2 100644
--- a/src/coreclr/vm/nativeimage.cpp
+++ b/src/coreclr/vm/nativeimage.cpp
@@ -286,7 +286,7 @@ void NativeImage::CheckAssemblyMvid(Assembly *assembly) const
 
     SString message;
     message.Printf(W("MVID mismatch between loaded assembly '%s' (MVID = %s) and an assembly with the same simple name embedded in the native image '%s' (MVID = %s)"),
-        assembly->GetSimpleName(),
+        SString(SString::Utf8, assembly->GetSimpleName()).GetUnicode(),
         assemblyMvidText,
         SString(SString::Utf8, GetFileName()).GetUnicode(),
         componentMvidText);