diff --git a/tests/libtest/lib1565.c b/tests/libtest/lib1565.c
index 5cf49ad0b6..e6c266a7e5 100644
--- a/tests/libtest/lib1565.c
+++ b/tests/libtest/lib1565.c
@@ -129,7 +129,7 @@ static CURLcode test_lib1565(const char *URL)
       }
       else {
         curl_mfprintf(stderr,
-                      "%s:%d Got an unexpected message from curl: %i\n",
+                      "%s:%d Got an unexpected message from curl: %d\n",
                       __FILE__, __LINE__, message->msg);
         result = TEST_ERR_MAJOR_BAD;
         goto test_cleanup;
diff --git a/tests/libtest/lib1597.c b/tests/libtest/lib1597.c
index 78b2bba4c2..5e3fab8cad 100644
--- a/tests/libtest/lib1597.c
+++ b/tests/libtest/lib1597.c
@@ -100,7 +100,7 @@ static CURLcode test_lib1597(const char *URL)
       break;
     }
   }
-  curl_mprintf("Tested %u strings\n", i);
+  curl_mprintf("Tested %d strings\n", i);
 
 test_cleanup:
   curl_easy_cleanup(curl);
diff --git a/tests/libtest/lib1918.c b/tests/libtest/lib1918.c
index 1c8ccb78f9..cc6fe1949d 100644
--- a/tests/libtest/lib1918.c
+++ b/tests/libtest/lib1918.c
@@ -37,11 +37,11 @@ static CURLcode test_lib1918(const char *URL)
       curl_easy_option_by_id(o->id);
 
     if(ename->id != o->id) {
-      curl_mprintf("name lookup id %d does not match %d\n",
+      curl_mprintf("name lookup id %u does not match %u\n",
                    ename->id, o->id);
     }
     else if(eid->id != o->id) {
-      curl_mprintf("ID lookup %d does not match %d\n",
+      curl_mprintf("ID lookup %u does not match %u\n",
                    ename->id, o->id);
     }
   }
diff --git a/tests/libtest/lib1947.c b/tests/libtest/lib1947.c
index 4fe2bf5801..88a6336dbe 100644
--- a/tests/libtest/lib1947.c
+++ b/tests/libtest/lib1947.c
@@ -63,7 +63,7 @@ static CURLcode test_lib1947(const char *URL)
     if(h)
       count++;
   } while(h);
-  curl_mprintf("count = %u\n", count);
+  curl_mprintf("count = %d\n", count);
 
   /* perform another request - without redirect */
   easy_setopt(curl, CURLOPT_URL, libtest_arg2);
@@ -81,7 +81,7 @@ static CURLcode test_lib1947(const char *URL)
     if(h)
       count++;
   } while(h);
-  curl_mprintf("count = %u\n", count);
+  curl_mprintf("count = %d\n", count);
 
 test_cleanup:
   curl_easy_cleanup(curl);
diff --git a/tests/libtest/lib2032.c b/tests/libtest/lib2032.c
index e87eb5ecad..0dd498c9bb 100644
--- a/tests/libtest/lib2032.c
+++ b/tests/libtest/lib2032.c
@@ -153,7 +153,7 @@ static CURLcode test_lib2032(const char *URL) /* libntlmconnect */
     multi_perform(multi, &running);
 
     curl_mfprintf(stderr, "%s:%d running %d state %d\n",
-                  __FILE__, __LINE__, running, state);
+                  __FILE__, __LINE__, running, (int)state);
 
     abort_on_test_timeout();
 
@@ -177,7 +177,8 @@ static CURLcode test_lib2032(const char *URL) /* libntlmconnect */
       }
       state =
         num_handles < MAX_EASY_HANDLES ? ReadyForNewHandle : NoMoreHandles;
-      curl_mfprintf(stderr, "%s:%d new state %d\n", __FILE__, __LINE__, state);
+      curl_mfprintf(stderr, "%s:%d new state %d\n",
+                    __FILE__, __LINE__, (int)state);
     }
 
     multi_timeout(multi, &timeout);