diff --git a/lib/Target/R600/SIInstrInfo.h b/lib/Target/R600/SIInstrInfo.h
index f3285cff6c4..4d3371b1aec 100644
--- a/lib/Target/R600/SIInstrInfo.h
+++ b/lib/Target/R600/SIInstrInfo.h
@@ -254,6 +254,13 @@ public:
   // instruction opcode.
   unsigned getOpSize(uint16_t Opcode, unsigned OpNo) const {
     const MCOperandInfo &OpInfo = get(Opcode).OpInfo[OpNo];
+
+    if (OpInfo.RegClass == -1) {
+      // If this is an immediate operand, this must be a 32-bit literal.
+      assert(OpInfo.OperandType == MCOI::OPERAND_IMMEDIATE);
+      return 4;
+    }
+
     return RI.getRegClass(OpInfo.RegClass)->getSize();
   }