diff --git a/include/custom.h b/include/custom.h
index df2f5c8..46a756d 100644
--- a/include/custom.h
+++ b/include/custom.h
@@ -27,9 +27,10 @@ enum libab_operator_variant_e {
 enum libab_behavior_variant_e { BIMPL_INTERNAL, BIMPL_TREE };
 
 /**
- * A struct that represents the implementation of a behavior.
+ * The common information
+ * that both operators and functions shared.
  */
-struct libab_behavior_impl_s {
+struct libab_behavior_s {
     /**
      * The variant of this implementation.
      */
@@ -46,16 +47,6 @@ struct libab_behavior_impl_s {
     } data_u;
 };
 
-/**
- * The common information
- * that both operators and functions shared.
- */
-struct libab_behavior_s {
-    /**
-     * The implementation of this behavior.
-     */
-    struct libab_behavior_impl_s impl;
-};
 /**
  * A struct that holds informatiion
  * about an operator that has been
@@ -100,7 +91,6 @@ struct libab_function_s {
 
 typedef enum libab_operator_variant_e libab_operator_variant;
 typedef enum libab_behavior_variant_e libab_behavior_variant;
-typedef struct libab_behavior_impl_s libab_behavior_impl;
 typedef struct libab_behavior_s libab_behavior;
 typedef struct libab_operator_s libab_operator;
 typedef struct libab_function_s libab_function;
diff --git a/src/custom.c b/src/custom.c
index cdf241f..7240fc0 100644
--- a/src/custom.c
+++ b/src/custom.c
@@ -2,19 +2,19 @@
 
 void libab_behavior_init_internal(libab_behavior* behavior,
                                   libab_function_ptr func) {
-    behavior->impl.variant = BIMPL_INTERNAL;
-    behavior->impl.data_u.internal = func;
+    behavior->variant = BIMPL_INTERNAL;
+    behavior->data_u.internal = func;
 }
 
 void libab_behavior_init_tree(libab_behavior* behavior,
                               libab_tree* tree) {
-    behavior->impl.variant = BIMPL_TREE;
-    behavior->impl.data_u.tree = tree;
+    behavior->variant = BIMPL_TREE;
+    behavior->data_u.tree = tree;
 }
 
 void libab_behavior_free(libab_behavior* behavior) {
-    if (behavior->impl.variant == BIMPL_TREE) {
-        libab_tree_free_recursive(behavior->impl.data_u.tree);
+    if (behavior->variant == BIMPL_TREE) {
+        libab_tree_free_recursive(behavior->data_u.tree);
     }
 }
 
diff --git a/src/libabacus.c b/src/libabacus.c
index be81384..a234a23 100644
--- a/src/libabacus.c
+++ b/src/libabacus.c
@@ -93,8 +93,8 @@ void _sanitize(char* to, const char* from, size_t buffer_size) {
 
 void _initialize_behavior(libab_behavior* behavior, libab_ref* type,
                           libab_function_ptr func) {
-    behavior->impl.variant = BIMPL_INTERNAL;
-    behavior->impl.data_u.internal = func;
+    behavior->variant = BIMPL_INTERNAL;
+    behavior->data_u.internal = func;
 }
 
 libab_result _register_operator(libab* ab, const char* op,