diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp
index bac01c7ff67f24..273d991c16c7b6 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.cpp
+++ b/clang/lib/CodeGen/CoverageMappingGen.cpp
@@ -1634,9 +1634,7 @@ static void dump(llvm::raw_ostream &OS, StringRef FunctionName,
 
 CoverageMappingModuleGen::CoverageMappingModuleGen(
     CodeGenModule &CGM, CoverageSourceInfo &SourceInfo)
-    : CGM(CGM), SourceInfo(SourceInfo) {
-  CoveragePrefixMap = CGM.getCodeGenOpts().CoveragePrefixMap;
-}
+    : CGM(CGM), SourceInfo(SourceInfo) {}
 
 std::string CoverageMappingModuleGen::getCurrentDirname() {
   if (!CGM.getCodeGenOpts().CoverageCompilationDir.empty())
@@ -1650,7 +1648,7 @@ std::string CoverageMappingModuleGen::getCurrentDirname() {
 std::string CoverageMappingModuleGen::normalizeFilename(StringRef Filename) {
   llvm::SmallString<256> Path(Filename);
   llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
-  for (const auto &Entry : CoveragePrefixMap) {
+  for (const auto &Entry : CGM.getCodeGenOpts().CoveragePrefixMap) {
     if (llvm::sys::path::replace_path_prefix(Path, Entry.first, Entry.second))
       break;
   }
diff --git a/clang/lib/CodeGen/CoverageMappingGen.h b/clang/lib/CodeGen/CoverageMappingGen.h
index f5282601b6406d..eca68d9abd79aa 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.h
+++ b/clang/lib/CodeGen/CoverageMappingGen.h
@@ -107,7 +107,6 @@ class CoverageMappingModuleGen {
   llvm::SmallDenseMap<const FileEntry *, unsigned, 8> FileEntries;
   std::vector<llvm::Constant *> FunctionNames;
   std::vector<FunctionInfo> FunctionRecords;
-  std::map<std::string, std::string> CoveragePrefixMap;
 
   std::string getCurrentDirname();
   std::string normalizeFilename(StringRef Filename);