diff --git a/src/options.c b/src/options.c
index c55e63b1..ed1cf921 100644
--- a/src/options.c
+++ b/src/options.c
@@ -63,6 +63,7 @@ typedef struct mi_option_desc_s {
 #define MI_DEFAULT_ARENA_EAGER_COMMIT 2
 #endif
 
+// in KiB
 #ifndef MI_DEFAULT_ARENA_RESERVE
  #if (MI_INTPTR_SIZE>4)
   #define MI_DEFAULT_ARENA_RESERVE 1024L*1024L
@@ -197,7 +198,6 @@ mi_decl_nodiscard long mi_option_get_clamp(mi_option_t option, long min, long ma
 }
 
 mi_decl_nodiscard size_t mi_option_get_size(mi_option_t option) {
-  mi_assert_internal(mi_option_has_size_in_kib(option));
   const long x = mi_option_get(option);
   size_t size = (x < 0 ? 0 : (size_t)x);
   if (mi_option_has_size_in_kib(option)) {