diff --git a/tests/convert_numbers_test.c b/tests/convert_numbers_test.c
index 697241ae8..edc534079 100644
--- a/tests/convert_numbers_test.c
+++ b/tests/convert_numbers_test.c
@@ -45,7 +45,7 @@ static void test_utils_textToInt(void)
         int64_t res;
         int converted;
 
-        converted = utils_textToInt((uint8_t*)ints_text[i], strlen(ints_text[i]), &res);
+        converted = utils_textToInt((const uint8_t*)ints_text[i], strlen(ints_text[i]), &res);
 
         CU_ASSERT(converted);
         if (converted)
@@ -70,7 +70,7 @@ static void test_utils_textToUInt(void)
         uint64_t res;
         int converted;
 
-        converted = utils_textToUInt((uint8_t*)uints_text[i], strlen(uints_text[i]), &res);
+        converted = utils_textToUInt((const uint8_t*)uints_text[i], strlen(uints_text[i]), &res);
 
         CU_ASSERT(converted);
         if (converted)
@@ -95,7 +95,7 @@ static void test_utils_textToFloat(void)
         double res;
         int converted;
 
-        converted = utils_textToFloat((uint8_t*)floats_text[i], strlen(floats_text[i]), &res, false);
+        converted = utils_textToFloat((const uint8_t*)floats_text[i], strlen(floats_text[i]), &res, false);
 
         CU_ASSERT(converted);
         if (converted)
@@ -120,7 +120,7 @@ static void test_utils_textToFloatExponential(void)
         double res;
         int converted;
 
-        converted = utils_textToFloat((uint8_t*)floats_exponential[i], strlen(floats_exponential[i]), &res, true);
+        converted = utils_textToFloat((const uint8_t*)floats_exponential[i], strlen(floats_exponential[i]), &res, true);
 
         CU_ASSERT(converted);
         if (converted)
@@ -145,21 +145,21 @@ static void test_utils_textToObjLink(void)
     uint16_t objectId;
     uint16_t objectInstanceId;
     CU_ASSERT_EQUAL(utils_textToObjLink(NULL, 0, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"", 0, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)":", 1, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"0:", 2, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)":0", 2, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"0:0", 3, &objectId, &objectInstanceId), 1);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"", 0, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)":", 1, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"0:", 2, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)":0", 2, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"0:0", 3, &objectId, &objectInstanceId), 1);
     CU_ASSERT_EQUAL(objectId, 0);
     CU_ASSERT_EQUAL(objectInstanceId, 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"1:2", 3, &objectId, &objectInstanceId), 1);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"1:2", 3, &objectId, &objectInstanceId), 1);
     CU_ASSERT_EQUAL(objectId, 1);
     CU_ASSERT_EQUAL(objectInstanceId, 2);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"65535:65535", 11, &objectId, &objectInstanceId), 1);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"65535:65535", 11, &objectId, &objectInstanceId), 1);
     CU_ASSERT_EQUAL(objectId, 65535);
     CU_ASSERT_EQUAL(objectInstanceId, 65535);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"65536:65535", 11, &objectId, &objectInstanceId), 0);
-    CU_ASSERT_EQUAL(utils_textToObjLink((uint8_t*)"65535:65536", 11, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"65536:65535", 11, &objectId, &objectInstanceId), 0);
+    CU_ASSERT_EQUAL(utils_textToObjLink((const uint8_t*)"65535:65536", 11, &objectId, &objectInstanceId), 0);
 }
 
 static void test_utils_intToText(void)