diff --git a/core/utils.c b/core/utils.c
index f4973f770..c30fd60be 100644
--- a/core/utils.c
+++ b/core/utils.c
@@ -218,7 +218,7 @@ size_t utils_intToText(int64_t data,
             string[int64_min_strlen] = '\0';
             return int64_min_strlen;
         }
-        result = utils_uintToText((uint64_t)labs(data), string + 1, length - 1);
+        result = utils_uintToText(llabs(data), string + 1, length - 1);
         if(result != 0)
         {
             result += 1;
diff --git a/wakaama.cmake b/wakaama.cmake
index fbbfc41f7..fa679eda9 100644
--- a/wakaama.cmake
+++ b/wakaama.cmake
@@ -124,6 +124,7 @@ add_compile_options(
     -Wshadow
     -Wswitch-default
     -Wwrite-strings
+    -Werror=absolute-value
     -pedantic
 )