diff --git a/lib/SPIRV/libSPIRV/SPIRVInstruction.h b/lib/SPIRV/libSPIRV/SPIRVInstruction.h
index 19ea34040d..63fff95aad 100644
--- a/lib/SPIRV/libSPIRV/SPIRVInstruction.h
+++ b/lib/SPIRV/libSPIRV/SPIRVInstruction.h
@@ -859,6 +859,8 @@ class SPIRVBranchConditional : public SPIRVInstruction {
            getCondition()->getType()->isTypeBool());
     assert(getTrueLabel()->isForward() || getTrueLabel()->isLabel());
     assert(getFalseLabel()->isForward() || getFalseLabel()->isLabel());
+    if (Module->isAllowedToUseVersion(VersionNumber::SPIRV_1_6))
+      assert(TrueLabelId != FalseLabelId);
   }
   SPIRVId ConditionId;
   SPIRVId TrueLabelId;