diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index 1445f6f11b..382d8cc9f8 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -1546,7 +1546,7 @@ static void test_reg_query_value(void)
     ret = RegQueryValueA(hkey_main, "subkey", val, NULL);
     ok(ret == ERROR_INVALID_PARAMETER, "Expected ERROR_INVALID_PARAMETER, got %d\n", ret);
     ok(GetLastError() == 0xdeadbeef, "Expected 0xdeadbeef, got %d\n", GetLastError());
-    ok(lstrlenA(val) == 0, "Expected val to be untouched, got %s\n", val);
+    ok(!val[0], "Expected val to be untouched, got %s\n", val);
 
     /* try a NULL value and size */
     ret = RegQueryValueA(hkey_main, "subkey", NULL, NULL);
@@ -1559,7 +1559,7 @@ static void test_reg_query_value(void)
     ret = RegQueryValueA(hkey_main, "subkey", val, &size);
     ok(ret == ERROR_MORE_DATA, "Expected ERROR_MORE_DATA, got %d\n", ret);
     ok(GetLastError() == 0xdeadbeef, "Expected 0xdeadbeef, got %d\n", GetLastError());
-    ok(lstrlenA(val) == 0, "Expected val to be untouched, got %s\n", val);
+    ok(!val[0], "Expected val to be untouched, got %s\n", val);
     ok(size == 5, "Expected 5, got %d\n", size);
 
     /* successfully read the value using 'subkey' */
@@ -1588,7 +1588,7 @@ static void test_reg_query_value(void)
     }
     ok(ret == ERROR_MORE_DATA, "Expected ERROR_MORE_DATA, got %d\n", ret);
     ok(GetLastError() == 0xdeadbeef, "Expected 0xdeadbeef, got %d\n", GetLastError());
-    ok(lstrlenW(valW) == 0, "Expected valW to be untouched\n");
+    ok(!valW[0], "Expected valW to be untouched\n");
     ok(size == sizeof(expected), "Got wrong size: %d\n", size);
 
     /* unicode - try size in WCHARS */
@@ -1597,7 +1597,7 @@ static void test_reg_query_value(void)
     ret = RegQueryValueW(subkey, NULL, valW, &size);
     ok(ret == ERROR_MORE_DATA, "Expected ERROR_MORE_DATA, got %d\n", ret);
     ok(GetLastError() == 0xdeadbeef, "Expected 0xdeadbeef, got %d\n", GetLastError());
-    ok(lstrlenW(valW) == 0, "Expected valW to be untouched\n");
+    ok(!valW[0], "Expected valW to be untouched\n");
     ok(size == sizeof(expected), "Got wrong size: %d\n", size);
 
     /* unicode - successfully read the value */
@@ -1764,8 +1764,7 @@ static void test_reg_delete_tree(void)
     ret = RegQueryValueA(subkey, NULL, buffer, &size);
     ok(ret == ERROR_SUCCESS,
         "Default value of subkey is not present\n");
-    ok(!lstrlenA(buffer),
-        "Expected length 0 got length %u(%s)\n", lstrlenA(buffer), buffer);
+    ok(!buffer[0], "Expected length 0 got length %u(%s)\n", lstrlenA(buffer), buffer);
     size = MAX_PATH;
     ok(RegQueryValueA(subkey, "value", buffer, &size),
         "Value is still present\n");
diff --git a/dlls/advapi32/tests/service.c b/dlls/advapi32/tests/service.c
index beb589dce0..ad81a25218 100644
--- a/dlls/advapi32/tests/service.c
+++ b/dlls/advapi32/tests/service.c
@@ -1398,8 +1398,8 @@ static void test_enum_svc(void)
         SERVICE_STATUS status = services[i].ServiceStatus;
 
         /* lpServiceName and lpDisplayName should always be filled */
-        ok(lstrlenA(services[i].lpServiceName) > 0, "Expected a service name\n");
-        ok(lstrlenA(services[i].lpDisplayName) > 0, "Expected a display name\n");
+        ok(services[i].lpServiceName[0], "Expected a service name\n");
+        ok(services[i].lpDisplayName[0], "Expected a display name\n");
 
         /* Decrement the counters to see if the functions calls return the same
          * numbers as the contents of these structures.
@@ -1701,8 +1701,8 @@ static void test_enum_svc(void)
         SERVICE_STATUS_PROCESS status = exservices[i].ServiceStatusProcess;
 
         /* lpServiceName and lpDisplayName should always be filled */
-        ok(lstrlenA(exservices[i].lpServiceName) > 0, "Expected a service name\n");
-        ok(lstrlenA(exservices[i].lpDisplayName) > 0, "Expected a display name\n");
+        ok(exservices[i].lpServiceName[0], "Expected a service name\n");
+        ok(exservices[i].lpDisplayName[0], "Expected a display name\n");
 
         /* Decrement the counters to see if the functions calls return the
          * same numbers as the contents of these structures.