diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index a8dec48b5..6bfbac500 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -1183,9 +1183,8 @@ macro(process_options)
   if(${NS3_INT64X64} MATCHES "INT128")
     check_cxx_source_compiles(
       "#include <stdint.h>
-       int main(int argc, char **argv)
+       int main()
          {
-            (void)argc; (void)argv;
             if ((uint128_t *) 0) return 0;
             if (sizeof (uint128_t)) return 0;
             return 1;
@@ -1194,9 +1193,8 @@ macro(process_options)
     )
     check_cxx_source_compiles(
       "#include <stdint.h>
-       int main(int argc, char **argv)
+       int main()
          {
-           (void)argc; (void)argv;
            if ((__uint128_t *) 0) return 0;
            if (sizeof (__uint128_t)) return 0;
            return 1;
diff --git a/src/core/model/assert.h b/src/core/model/assert.h
index 4902412e9..104a9e97c 100644
--- a/src/core/model/assert.h
+++ b/src/core/model/assert.h
@@ -98,13 +98,13 @@
 #define NS_ASSERT(condition)                                                                       \
     do                                                                                             \
     {                                                                                              \
-        (void)sizeof(condition);                                                                   \
+        sizeof(condition);                                                                         \
     } while (false)
 
 #define NS_ASSERT_MSG(condition, message)                                                          \
     do                                                                                             \
     {                                                                                              \
-        (void)sizeof(condition);                                                                   \
+        sizeof(condition);                                                                         \
     } while (false)
 
 #endif /* NS3_ASSERT_ENABLE */
diff --git a/src/core/model/test.cc b/src/core/model/test.cc
index b2392a904..cb268ba64 100644
--- a/src/core/model/test.cc
+++ b/src/core/model/test.cc
@@ -54,7 +54,7 @@ TestDoubleIsEqual(const double x1, const double x2, const double epsilon)
     //
     {
         double max = (std::fabs(x1) > std::fabs(x2)) ? x1 : x2;
-        (void)std::frexp(max, &exponent);
+        std::frexp(max, &exponent);
     }
 
     //