diff --git a/src/IceTargetLoweringARM32.cpp b/src/IceTargetLoweringARM32.cpp
index 9f7a90d..faf1aa0 100644
--- a/src/IceTargetLoweringARM32.cpp
+++ b/src/IceTargetLoweringARM32.cpp
@@ -348,17 +348,17 @@
   return false;
 }
 
-IceString TargetARM32::RegNames[] = {
-#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
-          isFP)                                                                \
-  name,
-    REGARM32_TABLE
-#undef X
-};
-
 IceString TargetARM32::getRegName(SizeT RegNum, Type Ty) const {
   assert(RegNum < RegARM32::Reg_NUM);
   (void)Ty;
+  static const char *RegNames[] = {
+#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
+          isFP)                                                                \
+  name,
+      REGARM32_TABLE
+#undef X
+  };
+
   return RegNames[RegNum];
 }
 
diff --git a/src/IceTargetLoweringARM32.h b/src/IceTargetLoweringARM32.h
index 1e0f284..198563c 100644
--- a/src/IceTargetLoweringARM32.h
+++ b/src/IceTargetLoweringARM32.h
@@ -389,7 +389,6 @@
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
-  static IceString RegNames[];
 
   /// Helper class that understands the Calling Convention and register
   /// assignments. The first few integer type parameters can use r0-r3,
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index a7e85a8..add97b3 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -220,17 +220,16 @@
   return false;
 }
 
-IceString TargetMIPS32::RegNames[] = {
-#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
-          isFP)                                                                \
-  name,
-    REGMIPS32_TABLE
-#undef X
-};
-
 IceString TargetMIPS32::getRegName(SizeT RegNum, Type Ty) const {
   assert(RegNum < RegMIPS32::Reg_NUM);
   (void)Ty;
+  static const char *RegNames[] = {
+#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
+          isFP)                                                                \
+  name,
+      REGMIPS32_TABLE
+#undef X
+  };
   return RegNames[RegNum];
 }
 
diff --git a/src/IceTargetLoweringMIPS32.h b/src/IceTargetLoweringMIPS32.h
index e581ffa..e63d738 100644
--- a/src/IceTargetLoweringMIPS32.h
+++ b/src/IceTargetLoweringMIPS32.h
@@ -129,7 +129,6 @@
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
-  static IceString RegNames[];
 
 private:
   ~TargetMIPS32() override = default;