diff --git a/tests/data/test557 b/tests/data/test557
index b251a4b31e..dce8aff669 100644
--- a/tests/data/test557
+++ b/tests/data/test557
@@ -35,7 +35,7 @@ All curl_mprintf() signed long tests OK!
 All curl_mprintf() curl_off_t tests OK!
 All curl_mprintf() strings tests OK!
 All float strings tests OK!
-All curl_mprintf() octal & hexadecimal tests OK!
+All curl_mprintf() octal and hexadecimal tests OK!
 </stdout>
 </verify>
 
diff --git a/tests/libtest/lib557.c b/tests/libtest/lib557.c
index 84f6120211..ba796f1ceb 100644
--- a/tests/libtest/lib557.c
+++ b/tests/libtest/lib557.c
@@ -1495,9 +1495,9 @@ static int test_oct_hex_formatting(void)
 #endif
 
   if(!errors)
-    curl_mprintf("All curl_mprintf() octal & hexadecimal tests OK!\n");
+    curl_mprintf("All curl_mprintf() octal and hexadecimal tests OK!\n");
   else
-    curl_mprintf("Some curl_mprintf() octal & hexadecimal tests Failed!\n");
+    curl_mprintf("Some curl_mprintf() octal or hexadecimal tests Failed!\n");
 
   return errors;
 }