diff --git a/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp b/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
index 716b22e3b37..a12b8d4b771 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
@@ -279,6 +279,7 @@ public:
     } else if (MO.isExpr()) {
       int64_t Value;
       bool Invalid = MO.getExpr()->EvaluateAsAbsolute(Value);
+      (void) Invalid;
       assert(!Invalid && "non-constant expression is not a valid SOImm operand");
       assert((Value >= INT32_MIN && Value <= INT32_MAX) &&
              "expression must be representable in 32 bits");