diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
index 66088bd88e5..75d255fe7e7 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
@@ -1358,7 +1358,7 @@ static int readModRM(struct InternalInstruction* insn) {
       break;
     case 0x1:
       insn->displacementSize = 1;
-      // FALLTHROUGH
+      /* FALLTHROUGH */
     case 0x2:
       insn->eaDisplacement = (mod == 0x1 ? EA_DISP_8 : EA_DISP_32);
       switch (rm) {