diff --git a/src/arch/arm/isa/formats/aarch64.isa b/src/arch/arm/isa/formats/aarch64.isa
index 9ad2de2c72..47d509e808 100644
--- a/src/arch/arm/isa/formats/aarch64.isa
+++ b/src/arch/arm/isa/formats/aarch64.isa
@@ -2461,7 +2461,7 @@ namespace Aarch64
                 return new Unknown64(machInst);
             }
         } else if (bits(machInst, 15) == 1) {
-            return decodeNeon3SameExtra<DecoderFeatures>(machInst);
+            return decodeNeon3RegExtension<DecoderFeatures>(machInst);
         } else if (bits(machInst, 10) == 1) {
             if (bits(machInst, 23, 22))
                 return new Unknown64(machInst);
diff --git a/src/arch/arm/isa/formats/neon64.isa b/src/arch/arm/isa/formats/neon64.isa
index 72b7e28d42..c200da74a8 100644
--- a/src/arch/arm/isa/formats/neon64.isa
+++ b/src/arch/arm/isa/formats/neon64.isa
@@ -39,9 +39,9 @@ namespace Aarch64
     // AdvSIMD three same
     template <typename DecoderFeatures>
     StaticInstPtr decodeNeon3Same(ExtMachInst machInst);
-    // AdvSIMD three same Extra
+    // AdvSIMD three register extension
     template <typename DecoderFeatures>
-    StaticInstPtr decodeNeon3SameExtra(ExtMachInst machInst);
+    StaticInstPtr decodeNeon3RegExtension(ExtMachInst machInst);
     // AdvSIMD three different
     inline StaticInstPtr decodeNeon3Diff(ExtMachInst machInst);
     // AdvSIMD two-reg misc
@@ -507,7 +507,7 @@ namespace Aarch64
 
     template <typename DecoderFeatures>
     StaticInstPtr
-    decodeNeon3SameExtra(ExtMachInst machInst)
+    decodeNeon3RegExtension(ExtMachInst machInst)
     {
         uint8_t q      = bits(machInst, 30);
         uint8_t size   = bits(machInst, 23, 22);