diff --git a/llvm/lib/Target/AMDGPU/VOP3PInstructions.td b/llvm/lib/Target/AMDGPU/VOP3PInstructions.td
index 5d186c337a99c..ca85fe1ca9073 100644
--- a/llvm/lib/Target/AMDGPU/VOP3PInstructions.td
+++ b/llvm/lib/Target/AMDGPU/VOP3PInstructions.td
@@ -1664,11 +1664,15 @@ multiclass WMMAInstGFX12<string Instr, VOP3PWMMA_Profile WMMAProfile, string Pse
     let Constraints = WMMAConstraints2Addr, isConvertibleToThreeAddress = 1 in
       def _twoaddr : VOP3P_Pseudo<Instr, WMMAProfile>, WMMAInstInfo {
         let PseudoInstr = Instr#PseudoInstrSuffix;
+        let FixedSize = WMMAProfile.HasMatrixScale;
+        let Size = !if(WMMAProfile.HasMatrixScale, 16, 8);
       }
 
     let Constraints = WMMAConstraints3Addr, SchedRW = [Write32Bit, Write32Bit] in
       def _threeaddr : VOP3P_Pseudo<Instr, WMMAProfile>, WMMAInstInfo {
         let PseudoInstr = Instr#PseudoInstrSuffix;
+        let FixedSize = WMMAProfile.HasMatrixScale;
+        let Size = !if(WMMAProfile.HasMatrixScale, 16, 8);
       }
 
   }