diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 7cf661994a29c..37d7a6755d390 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -554,14 +554,16 @@ void CGDebugInfo::CreateCompileUnit() {
     // If the main file name provided is identical to the input file name, and
     // if the input file is a preprocessed source, use the module name for
     // debug info. The module name comes from the name specified in the first
-    // linemarker if the input is a preprocessed source.
+    // linemarker if the input is a preprocessed source. In this case we don't
+    // know the content to compute a checksum.
     if (MainFile->getName() == MainFileName &&
         FrontendOptions::getInputKindForExtension(
             MainFile->getName().rsplit('.').second)
-            .isPreprocessed())
+            .isPreprocessed()) {
       MainFileName = CGM.getModule().getName().str();
-
-    CSKind = computeChecksum(SM.getMainFileID(), Checksum);
+    } else {
+      CSKind = computeChecksum(SM.getMainFileID(), Checksum);
+    }
   }
 
   llvm::dwarf::SourceLanguage LangTag;
diff --git a/clang/test/CodeGen/debug-info-preprocessed-file.i b/clang/test/CodeGen/debug-info-preprocessed-file.i
index 23fd26525e3bf..c8a2307d46c31 100644
--- a/clang/test/CodeGen/debug-info-preprocessed-file.i
+++ b/clang/test/CodeGen/debug-info-preprocessed-file.i
@@ -6,6 +6,10 @@
 # 1 "<built-in>" 2
 # 1 "preprocessed-input.c" 2
 
+/// The main file is preprocessed. We change it to preprocessed-input.c. Since
+/// the content is not available, we don't compute a checksum.
 // RUN: %clang -g -c -S -emit-llvm -o - %s | FileCheck %s
 // CHECK: !DICompileUnit(language: DW_LANG_C{{.*}}, file: ![[FILE:[0-9]+]]
 // CHECK: ![[FILE]] = !DIFile(filename: "/foo/bar/preprocessed-input.c"
+// CHECK-NOT: checksumkind:
+// CHECK-NOT: !DIFile(