diff --git a/xmss_commons.c b/xmss_commons.c
index 0752f29b2..cf031f883 100644
--- a/xmss_commons.c
+++ b/xmss_commons.c
@@ -21,9 +21,11 @@ void to_byte(unsigned char *out, unsigned long long in, uint32_t bytes)
   }
 }
 
+#if 0
 void hexdump(const unsigned char *a, size_t len)
 {
   size_t i;
   for (i = 0; i < len; i++)
     printf("%02x", a[i]);
 }
+#endif
diff --git a/xmss_commons.h b/xmss_commons.h
index 32fd4e2dc..2cb7cc555 100644
--- a/xmss_commons.h
+++ b/xmss_commons.h
@@ -11,5 +11,7 @@ Public domain.
 #include <stdint.h>
 
 void to_byte(unsigned char *output, unsigned long long in, uint32_t bytes);
+#if 0
 void hexdump(const unsigned char *a, size_t len);
-#endif
\ No newline at end of file
+#endif
+#endif