diff --git a/llvm/test/tools/llvm-cov/universal-binary.c b/llvm/test/tools/llvm-cov/universal-binary.c
--- a/llvm/test/tools/llvm-cov/universal-binary.c
+++ b/llvm/test/tools/llvm-cov/universal-binary.c
@@ -7,6 +7,8 @@
 // RUN: llvm-cov show %S/Inputs/universal-binary -instr-profile %t.profdata -path-equivalence=/tmp,%S %s -arch x86_64 | FileCheck %s
 
 // RUN: llvm-cov report %S/Inputs/universal-binary -arch x86_64 -object %S/Inputs/templateInstantiations.covmapping -arch i386 -instr-profile %t.profdata 2>&1 | FileCheck %s --check-prefix=COMBINED
+// RUN: llvm-cov report %S/Inputs/universal-binary -arch x86_64 -object %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata 2>&1 | FileCheck %s --check-prefix=COMBINED
+// RUN: not llvm-cov report %S/Inputs/universal-binary -arch i386 -object %S/Inputs/templateInstantiations.covmapping -instr-profile %t.profdata 2>&1 | FileCheck %s --check-prefix=WRONG-ARCH
 // COMBINED: showTemplateInstantiations.cpp
 // COMBINED-NEXT: universal-binary.c
 
diff --git a/llvm/tools/llvm-cov/CodeCoverage.cpp b/llvm/tools/llvm-cov/CodeCoverage.cpp
--- a/llvm/tools/llvm-cov/CodeCoverage.cpp
+++ b/llvm/tools/llvm-cov/CodeCoverage.cpp
@@ -883,6 +883,9 @@
         }
         CoverageArches.emplace_back(Arch);
       }
+      if (CoverageArches.size() == 1)
+        CoverageArches.insert(CoverageArches.end(), ObjectFilenames.size() - 1,
+                              CoverageArches[0]);
       if (CoverageArches.size() != ObjectFilenames.size()) {
         error("Number of architectures doesn't match the number of objects");
         return 1;