diff --git a/src/oat/runtime/arm/context_arm.cc b/src/oat/runtime/arm/context_arm.cc
index 7b45bc2a7..4e42e94 100644
--- a/src/oat/runtime/arm/context_arm.cc
+++ b/src/oat/runtime/arm/context_arm.cc
@@ -70,7 +70,7 @@
 }
 
 void ArmContext::SetGPR(uint32_t reg, uintptr_t value) {
-  DCHECK_LT(reg, kNumberOfCoreRegisters);
+  DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
   DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
   DCHECK(gprs_[reg] != NULL);
   *gprs_[reg] = value;
diff --git a/src/oat/runtime/arm/context_arm.h b/src/oat/runtime/arm/context_arm.h
index a2b9ebe..ec1d4cb 100644
--- a/src/oat/runtime/arm/context_arm.h
+++ b/src/oat/runtime/arm/context_arm.h
@@ -45,7 +45,7 @@
   }
 
   virtual uintptr_t GetGPR(uint32_t reg) {
-    CHECK_LT(reg, kNumberOfCoreRegisters);
+    CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
     return *gprs_[reg];
   }