diff --git a/common/memory_display.c b/common/memory_display.c
index eb188e1..7e4f4da 100644
--- a/common/memory_display.c
+++ b/common/memory_display.c
@@ -2,7 +2,7 @@
 
 #define DISP_LINE_LEN	16
 
-int memory_display(char *addr, loff_t offs, unsigned nbytes, int size, int swab)
+int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int swab)
 {
 	ulong linebytes, i;
 	u_char	*cp;
diff --git a/include/common.h b/include/common.h
index 744b19e..e813726 100644
--- a/include/common.h
+++ b/include/common.h
@@ -220,7 +220,7 @@
 #define PAGE_ALIGN(s) (((s) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
 #define PAGE_ALIGN_DOWN(x) ((x) & ~(PAGE_SIZE - 1))
 
-int memory_display(char *addr, loff_t offs, unsigned nbytes, int size, int swab);
+int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int swab);
 
 int mem_parse_options(int argc, char *argv[], char *optstr, int *mode,
 		char **sourcefile, char **destfile, int *swab);