diff --git a/src/cmc/intervalheap.h b/src/cmc/intervalheap.h
index 2c02201..e5d9b1b 100644
--- a/src/cmc/intervalheap.h
+++ b/src/cmc/intervalheap.h
@@ -798,11 +798,11 @@ struct cmc_callbacks_intervalheap
             V element1 = _heap1_->buffer[i / 2].data[i % 2];                   \
             V element2 = _heap2_->buffer[i / 2].data[i % 2];                   \
                                                                                \
-            if (_heap1_->f_val->cmp(element1, element2) == 0)                  \
-                return true;                                                   \
+            if (_heap1_->f_val->cmp(element1, element2) != 0)                  \
+                return false;                                                  \
         }                                                                      \
                                                                                \
-        return false;                                                          \
+        return true;                                                           \
     }                                                                          \
                                                                                \
     struct cmc_string PFX##_to_string(struct SNAME *_heap_)                    \
diff --git a/src/cmc/list.h b/src/cmc/list.h
index 2662686..560e1a8 100644
--- a/src/cmc/list.h
+++ b/src/cmc/list.h
@@ -867,7 +867,7 @@ struct cmc_callbacks_list
                 return false;                                                  \
         }                                                                      \
                                                                                \
-        return false;                                                          \
+        return true;                                                           \
     }                                                                          \
                                                                                \
     struct cmc_string PFX##_to_string(struct SNAME *_list_)                    \
diff --git a/tests/main/unt/list.c b/tests/main/unt/list.c
index 53e51c3..0628512 100644
--- a/tests/main/unt/list.c
+++ b/tests/main/unt/list.c
@@ -485,7 +485,15 @@ CMC_CREATE_UNIT(list_test, true, {
         cmc_assert_equals(int32_t, cmc_flags.OK, l_flag(l));
         cmc_assert_equals(int32_t, cmc_flags.OK, l_flag(l3));
 
+        // equals
+        l->flag = cmc_flags.ERROR;
+        l3->flag = cmc_flags.ERROR;
+        cmc_assert(l_equals(l, l3));
+        cmc_assert_equals(int32_t, cmc_flags.OK, l_flag(l));
+        cmc_assert_equals(int32_t, cmc_flags.OK, l_flag(l3));
+
         l_free(l);
         l_free(l2);
+        l_free(l3);
     });
 })