diff --git a/arch/XCore/XCoreInstPrinter.c b/arch/XCore/XCoreInstPrinter.c
index 666c624..db1f90d 100644
--- a/arch/XCore/XCoreInstPrinter.c
+++ b/arch/XCore/XCoreInstPrinter.c
@@ -29,7 +29,7 @@
 #include "../../MathExtras.h"
 #include "XCoreMapping.h"
 
-static const char *getRegisterName(unsigned RegNo);
+static char *getRegisterName(unsigned RegNo);
 
 void XCore_post_printer(csh ud, cs_insn *insn, char *insn_asm, MCInst *mci)
 {
@@ -194,7 +194,7 @@
 		unsigned reg;
 
 		reg = MCOperand_getReg(MO);
-		SStream_concat(O, "%s", getRegisterName(reg));
+		SStream_concat0(O, getRegisterName(reg));
 
 		if (MI->csh->detail) {
 			if (MI->csh->doing_mem) {