diff --git a/src/arch/arm/regs/misc.cc b/src/arch/arm/regs/misc.cc
index 00d5501d06..133411b144 100644
--- a/src/arch/arm/regs/misc.cc
+++ b/src/arch/arm/regs/misc.cc
@@ -1317,7 +1317,7 @@ encodeAArch64SysReg(MiscRegIndex misc_reg)
         it != idxToMiscRegNum.end()) {
         return it->second;
     } else {
-        panic("Invalid MiscRegIndex: %n\n", misc_reg);
+        panic("Invalid MiscRegIndex: %d\n", misc_reg);
     }
 }