diff --git a/mem/src/arena/mem_arena.c b/mem/src/arena/mem_arena.c
index 27b0bf4..7652cb4 100644
--- a/mem/src/arena/mem_arena.c
+++ b/mem/src/arena/mem_arena.c
@@ -35,7 +35,7 @@ internal void base_arena_free(BaseArena *arena);
 // PUBLIC API
 
 bool wapp_mem_arena_init(Arena **arena, u64 base_capacity) {
-  if (!arena || *arena) {
+  if (!arena || *arena || base_capacity == 0) {
     return false;
   }
 
@@ -178,7 +178,7 @@ void wapp_mem_arena_free(Arena **arena) {
 // INTERNAL FUNCTIONS
 
 internal bool base_arena_init(BaseArena *arena, u64 capacity) {
-  if (!arena || arena->buf) {
+  if (!arena || arena->buf || capacity == 0) {
     return false;
   }