diff --git a/lib/bsp/standalone/src/cortexa53/xil_printf.c b/lib/bsp/standalone/src/cortexa53/xil_printf.c
index cc10c957..8700d9dc 100644
--- a/lib/bsp/standalone/src/cortexa53/xil_printf.c
+++ b/lib/bsp/standalone/src/cortexa53/xil_printf.c
@@ -179,7 +179,7 @@ static s32 getnum( charptr* linep)
 
 /* void esp_printf( const func_ptr f_ptr,
    const charptr ctrl1, ...) */
-void xil_printf( char8 *ctrl1, ...)
+void xil_printf( const char8 *ctrl1, ...)
 {
 	s32 Check;
     s32 long_flag;
diff --git a/lib/bsp/standalone/src/cortexa53/xil_printf.h b/lib/bsp/standalone/src/cortexa53/xil_printf.h
index 6c1e1507..2be5c573 100644
--- a/lib/bsp/standalone/src/cortexa53/xil_printf.h
+++ b/lib/bsp/standalone/src/cortexa53/xil_printf.h
@@ -32,7 +32,7 @@ typedef s32 (*func_ptr)(int c);
 
 /*                                                   */
 
-void xil_printf( char8 *ctrl1, ...);
+void xil_printf( const char8 *ctrl1, ...);
 void print( const char8 *ptr);
 extern void outbyte (char8 c);
 extern char8 inbyte(void);
diff --git a/lib/bsp/standalone/src/cortexa9/xil_printf.c b/lib/bsp/standalone/src/cortexa9/xil_printf.c
index 701025b3..bfd25997 100644
--- a/lib/bsp/standalone/src/cortexa9/xil_printf.c
+++ b/lib/bsp/standalone/src/cortexa9/xil_printf.c
@@ -186,7 +186,7 @@ static s32 getnum( charptr* linep)
 
 /* void esp_printf( const func_ptr f_ptr,
    const charptr ctrl1, ...) */
-void xil_printf( char8 *ctrl1, ...)
+void xil_printf( const char8 *ctrl1, ...)
 {
 	s32 Check;
     s32 long_flag;
diff --git a/lib/bsp/standalone/src/cortexa9/xil_printf.h b/lib/bsp/standalone/src/cortexa9/xil_printf.h
index 6c1e1507..2be5c573 100644
--- a/lib/bsp/standalone/src/cortexa9/xil_printf.h
+++ b/lib/bsp/standalone/src/cortexa9/xil_printf.h
@@ -32,7 +32,7 @@ typedef s32 (*func_ptr)(int c);
 
 /*                                                   */
 
-void xil_printf( char8 *ctrl1, ...);
+void xil_printf( const char8 *ctrl1, ...);
 void print( const char8 *ptr);
 extern void outbyte (char8 c);
 extern char8 inbyte(void);
diff --git a/lib/bsp/standalone/src/cortexr5/xil_printf.c b/lib/bsp/standalone/src/cortexr5/xil_printf.c
index 701025b3..bfd25997 100644
--- a/lib/bsp/standalone/src/cortexr5/xil_printf.c
+++ b/lib/bsp/standalone/src/cortexr5/xil_printf.c
@@ -186,7 +186,7 @@ static s32 getnum( charptr* linep)
 
 /* void esp_printf( const func_ptr f_ptr,
    const charptr ctrl1, ...) */
-void xil_printf( char8 *ctrl1, ...)
+void xil_printf( const char8 *ctrl1, ...)
 {
 	s32 Check;
     s32 long_flag;
diff --git a/lib/bsp/standalone/src/cortexr5/xil_printf.h b/lib/bsp/standalone/src/cortexr5/xil_printf.h
index 6c1e1507..2be5c573 100644
--- a/lib/bsp/standalone/src/cortexr5/xil_printf.h
+++ b/lib/bsp/standalone/src/cortexr5/xil_printf.h
@@ -32,7 +32,7 @@ typedef s32 (*func_ptr)(int c);
 
 /*                                                   */
 
-void xil_printf( char8 *ctrl1, ...);
+void xil_printf( const char8 *ctrl1, ...);
 void print( const char8 *ptr);
 extern void outbyte (char8 c);
 extern char8 inbyte(void);