diff --git a/llvm/lib/Target/X86/X86ATTAsmPrinter.cpp b/llvm/lib/Target/X86/X86ATTAsmPrinter.cpp
index 95a2a11c07c8..b0e6ed127d4b 100644
--- a/llvm/lib/Target/X86/X86ATTAsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86ATTAsmPrinter.cpp
@@ -180,7 +180,7 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   }
 
   if (TAI->hasDotTypeDotSizeDirective())
-    O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
+    O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << "\n";
 
   if (TAI->doesSupportDebugInformation()) {
     // Emit post-function debug information.