1 files changed, 1 insertions, 1 deletions
diff --git a/hex.c b/hex.c
index 5b7a673f..ef67f06b 100644
--- a/hex.c
+++ b/hex.c
@@ -8,7 +8,7 @@
 
 #include "gpsd.h"
 
-char /*@ observer @*/ *gpsd_hexdump(char *binbuf, size_t binbuflen)
+const char /*@ observer @*/ *gpsd_hexdump(char *binbuf, size_t binbuflen)
 {
     char *cp;
     bool printable = true;