diff --git a/target/mips/tcg/mxu_translate.c b/target/mips/tcg/mxu_translate.c
index deb8060a17..b007948a73 100644
--- a/target/mips/tcg/mxu_translate.c
+++ b/target/mips/tcg/mxu_translate.c
@@ -609,7 +609,7 @@ enum {
 static TCGv mxu_gpr[NUMBER_OF_MXU_REGISTERS - 1];
 static TCGv mxu_CR;
 
-static const char mxuregnames[][4] = {
+static const char mxuregnames[NUMBER_OF_MXU_REGISTERS][4] = {
     "XR1",  "XR2",  "XR3",  "XR4",  "XR5",  "XR6",  "XR7",  "XR8",
     "XR9",  "XR10", "XR11", "XR12", "XR13", "XR14", "XR15", "XCR",
 };