diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index afdeccaf93a9df..3cb96df12e4da0 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -9875,6 +9875,7 @@ void ASTReader::finishPendingActions() {
             // We only perform ODR checks for decls not in the explicit
             // global module fragment.
             !shouldSkipCheckingODR(FD) &&
+            !shouldSkipCheckingODR(NonConstDefn) &&
             FD->getODRHash() != NonConstDefn->getODRHash()) {
           if (!isa<CXXMethodDecl>(FD)) {
             PendingFunctionOdrMergeFailures[FD].push_back(NonConstDefn);
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 3de9d327f1b3bc..31ab6c651d59f4 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -821,7 +821,7 @@ void ASTDeclReader::VisitEnumDecl(EnumDecl *ED) {
       Reader.mergeDefinitionVisibility(OldDef, ED);
       // We don't want to check the ODR hash value for declarations from global
       // module fragment.
-      if (!shouldSkipCheckingODR(ED) &&
+      if (!shouldSkipCheckingODR(ED) && !shouldSkipCheckingODR(OldDef) &&
           OldDef->getODRHash() != ED->getODRHash())
         Reader.PendingEnumOdrMergeFailures[OldDef].push_back(ED);
     } else {
@@ -2134,7 +2134,7 @@ void ASTDeclReader::MergeDefinitionData(
   }
 
   // We don't want to check ODR for decls in the global module fragment.
-  if (shouldSkipCheckingODR(MergeDD.Definition))
+  if (shouldSkipCheckingODR(MergeDD.Definition) || shouldSkipCheckingODR(D))
     return;
 
   if (D->getODRHash() != MergeDD.ODRHash) {
diff --git a/clang/test/Modules/pch-in-module-units.cppm b/clang/test/Modules/pch-in-module-units.cppm
new file mode 100644
index 00000000000000..790a3af09a0caa
--- /dev/null
+++ b/clang/test/Modules/pch-in-module-units.cppm
@@ -0,0 +1,51 @@
+// Test that we will skip ODR checks for declarations from PCH if they
+// were from GMF.
+//
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+// RUN: split-file %s %t
+//
+// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/A.cppm \
+// RUN:   -o %t/A.pcm -fskip-odr-check-in-gmf
+// RUN: %clang_cc1 -std=c++20 -DDIFF -x c++-header %t/foo.h \
+// RUN:   -emit-pch -o %t/foo.pch -fskip-odr-check-in-gmf
+// RUN: %clang_cc1 -std=c++20 %t/B.cppm -fmodule-file=A=%t/A.pcm -include-pch \
+// RUN:   %t/foo.pch -verify -fsyntax-only -fskip-odr-check-in-gmf
+
+//--- foo.h
+#ifndef FOO_H
+#define FOO_H
+inline int foo() {
+#ifndef DIFF
+  return 43;
+#else
+  return 45;
+#endif
+}
+
+class f {
+public:
+  int mem() {
+#ifndef DIFF
+    return 47;
+#else
+    return 45;
+#endif
+  }
+};
+#endif
+
+//--- A.cppm
+module;
+#include "foo.h"
+export module A;
+export using ::foo;
+export using ::f;
+
+//--- B.cppm
+// expected-no-diagnostics
+module;
+#include "foo.h"
+export module B;
+import A;
+export int b = foo() + f().mem();