4 files changed, 6 insertions, 6 deletions
diff --git a/tests/libtest/first.c b/tests/libtest/first.c
index 231ae368c..72140e314 100644
--- a/tests/libtest/first.c
+++ b/tests/libtest/first.c
@@ -116,7 +116,7 @@ static void memory_tracking_init(void)
 #endif
 
 /* returns a hexdump in a static memory area */
-char *hexdump(unsigned char *buffer, size_t len)
+char *hexdump(const unsigned char *buffer, size_t len)
 {
   static char dump[200*3+1];
   char *p = dump;
diff --git a/tests/libtest/lib506.c b/tests/libtest/lib506.c
index b8db83cb6..d26252b6f 100644
--- a/tests/libtest/lib506.c
+++ b/tests/libtest/lib506.c
@@ -33,7 +33,7 @@ struct Tdata {
 };
 
 struct userdata {
-  char *text;
+  const char *text;
   int counter;
 };
 
@@ -184,7 +184,7 @@ int test(char *URL)
   int i;
   struct userdata user;
 
-  user.text = (char *)"Pigs in space";
+  user.text = "Pigs in space";
   user.counter = 0;
 
   printf("GLOBAL_INIT\n");
diff --git a/tests/libtest/lib586.c b/tests/libtest/lib586.c
index a4fc6feee..859ef3430 100644
--- a/tests/libtest/lib586.c
+++ b/tests/libtest/lib586.c
@@ -31,7 +31,7 @@ struct Tdata {
 };
 
 struct userdata {
-  char *text;
+  const char *text;
   int counter;
 };
 
@@ -138,7 +138,7 @@ int test(char *URL)
   int i;
   struct userdata user;
 
-  user.text = (char *)"Pigs in space";
+  user.text = "Pigs in space";
   user.counter = 0;
 
   printf("GLOBAL_INIT\n");
diff --git a/tests/libtest/test.h b/tests/libtest/test.h
index 3da03b838..bb1acca0e 100644
--- a/tests/libtest/test.h
+++ b/tests/libtest/test.h
@@ -67,7 +67,7 @@ extern void wait_ms(int ms); /* wait this many milliseconds */
 extern int test(char *URL); /* the actual test function provided by each
                                individual libXXX.c file */
 
-extern char *hexdump(unsigned char *buffer, size_t len);
+extern char *hexdump(const unsigned char *buffer, size_t len);
 
 #ifdef UNITTESTS
 extern int unitfail;