diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -3036,6 +3036,10 @@
     // Try to further simplify the result.
     CallInst *SimplifiedCI = dyn_cast<CallInst>(SimplifiedFortifiedCI);
     if (SimplifiedCI && SimplifiedCI->getCalledFunction()) {
+
+      if (CI->isTailCall() && !SimplifiedCI->isTailCall())
+        SimplifiedCI->setTailCall();
+
       // Ensure that SimplifiedCI's uses are complete, since some calls have
       // their uses analyzed.
       replaceAllUsesWith(CI, SimplifiedCI);
diff --git a/llvm/test/Transforms/InstCombine/fortify-folding.ll b/llvm/test/Transforms/InstCombine/fortify-folding.ll
--- a/llvm/test/Transforms/InstCombine/fortify-folding.ll
+++ b/llvm/test/Transforms/InstCombine/fortify-folding.ll
@@ -11,12 +11,12 @@
 
 define i8* @test_memccpy() {
 ; CHECK-LABEL: @test_memccpy(
-; CHECK-NEXT:    [[MEMCCPY:%.*]] = call i8* @memccpy(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i64 0, i64 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i64 0, i64 0), i32 0, i64 60)
+; CHECK-NEXT:    [[MEMCCPY:%.*]] = tail call i8* @memccpy(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i64 0, i64 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i64 0, i64 0), i32 0, i64 60)
 ; CHECK-NEXT:    ret i8* [[MEMCCPY]]
 ;
   %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
   %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
-  %ret = call i8* @__memccpy_chk(i8* %dst, i8* %src, i32 0, i64 60, i64 -1)
+  %ret = tail call i8* @__memccpy_chk(i8* %dst, i8* %src, i32 0, i64 60, i64 -1)
   ret i8* %ret
 }