diff --git a/lib/Target/X86/X86InstrMMX.td b/lib/Target/X86/X86InstrMMX.td
index 43fadc219bb..b79a0064332 100644
--- a/lib/Target/X86/X86InstrMMX.td
+++ b/lib/Target/X86/X86InstrMMX.td
@@ -481,11 +481,11 @@ def MMX_PMOVMSKBrr : MMXI<0xD7, MRMSrcReg, (outs GR32:$dst), (ins VR64:$src),
 
 // Misc.
 let Uses = [EDI] in
-def MMX_MASKMOVQ : MMXI<0xF7, MRMDestMem, (outs), (ins VR64:$src, VR64:$mask),
+def MMX_MASKMOVQ : MMXI<0xF7, MRMSrcReg, (outs), (ins VR64:$src, VR64:$mask),
                         "maskmovq\t{$mask, $src|$src, $mask}",
                         [(int_x86_mmx_maskmovq VR64:$src, VR64:$mask, EDI)]>;
 let Uses = [RDI] in
-def MMX_MASKMOVQ64: MMXI64<0xF7, MRMDestMem, (outs), (ins VR64:$src, VR64:$mask),
+def MMX_MASKMOVQ64: MMXI64<0xF7, MRMSrcReg, (outs), (ins VR64:$src, VR64:$mask),
                            "maskmovq\t{$mask, $src|$src, $mask}",
                            [(int_x86_mmx_maskmovq VR64:$src, VR64:$mask, RDI)]>;