diff --git a/code/inc/utility.h b/code/inc/utility.h
index bee9745..ccb25fb 100644
--- a/code/inc/utility.h
+++ b/code/inc/utility.h
@@ -34,36 +34,38 @@ typedef i64_t                   isz_t;
 
 
 
-bool_t      pac_rune_is_lower_letter    (rune_t rune);
-bool_t      pac_rune_is_upper_letter    (rune_t rune);
-bool_t      pac_rune_is_letter          (rune_t rune);
-bool_t      pac_rune_is_digit           (rune_t rune);
-bool_t      pac_rune_is_blank           (rune_t rune);
-bool_t      pac_rune_is_sign            (rune_t rune);
+bool_t              pac_rune_is_lower_letter    (rune_t rune);
+bool_t              pac_rune_is_upper_letter    (rune_t rune);
+bool_t              pac_rune_is_letter          (rune_t rune);
+bool_t              pac_rune_is_digit           (rune_t rune);
+bool_t              pac_rune_is_blank           (rune_t rune);
+bool_t              pac_rune_is_sign            (rune_t rune);
 
 
 
-void        pac_memory_copy             (void *destination, void *source, usz_t length);
-void        pac_memory_fill             (void *region, usz_t len_region, u8_t byte);
-void        pac_memory_zero             (void *region, usz_t len_region);
+void                pac_memory_copy             (void *destination, void *source, usz_t length);
+void                pac_memory_fill             (void *region, usz_t len_region, u8_t byte);
+void                pac_memory_zero             (void *region, usz_t len_region);
 
 
 
-typedef struct pac_arena
+typedef struct pac_arena             pac_arena_s;
+
+struct pac_arena
 {
     usz_t                   len_allocation;
     usz_t                   offset;
     void                   *allocation;
     pac_arena_s            *continuation;
 
-} pac_arena_s;
+};
 
-pac_arena_s     pac_create_arena            (usz_t size);
-void            pac_delete_arena            (pac_arena_s arena);
+pac_arena_s         pac_create_arena            (usz_t size);
+void                pac_delete_arena            (pac_arena_s arena);
 
-void            pac_free_arena              (pac_arena_s *arena);
-pac_arena_s *   pac_new_arena               (usz_t size);
+void                pac_free_arena              (pac_arena_s *arena);
+pac_arena_s *       pac_new_arena               (usz_t size);
 
-void *          pac_arena_alloc             (pac_arena_s *arena, usz_t length);
+void *              pac_arena_alloc             (pac_arena_s *arena, usz_t length);
 
 #endif // Include Guard (TN_UTIL_TYPES_H)
diff --git a/code/src/allocator.c b/code/src/allocator.c
index 0ded8bc..10af42a 100644
--- a/code/src/allocator.c
+++ b/code/src/allocator.c
@@ -1,5 +1,7 @@
 #include <utility.h>
 
+#include <stdlib.h>
+
 pac_arena_s pac_create_arena(usz_t size)
 {
     pac_arena_s                 arena;
diff --git a/code/src/logger.c b/code/src/logger.c
index c7f8ada..a7fabd0 100644
--- a/code/src/logger.c
+++ b/code/src/logger.c
@@ -1,5 +1,7 @@
 #include <logger.h>
 
+#include <stdlib.h>
+
 pac_logger_s pac_create_logger()
 {
     pac_logger_s                logger;
@@ -41,5 +43,5 @@ void pac_log_naming_error(pac_logger_s *logger, pac_naming_error_s error)
 
 void * pac_log_alloc(pac_logger_s *logger, usz_t num_bytes)
 {
-    return ac_arena_alloc(logger->string_arena, num_bytes);
+    return pac_arena_alloc(&logger->string_arena, num_bytes);
 }