diff --git a/core/hakmem_super_registry.c b/core/hakmem_super_registry.c
index 18500c25..b30b7cf2 100644
--- a/core/hakmem_super_registry.c
+++ b/core/hakmem_super_registry.c
@@ -1,5 +1,6 @@
 #include "hakmem_super_registry.h"
 #include "hakmem_tiny_superslab.h"
+#include "box/ss_allocation_box.h"  // For superslab_allocate() declaration
 #include <string.h>
 #include <stdio.h>
 #include <sys/mman.h>  // munmap for incompatible SuperSlab eviction
diff --git a/core/hakmem_tiny_superslab_internal.h b/core/hakmem_tiny_superslab_internal.h
index 0afbbf67..cb392fb1 100644
--- a/core/hakmem_tiny_superslab_internal.h
+++ b/core/hakmem_tiny_superslab_internal.h
@@ -8,6 +8,7 @@
 
 #include "hakmem_tiny_superslab.h"
 #include "box/ss_hot_cold_box.h"
+#include "box/ss_allocation_box.h"  // CRITICAL: For superslab_allocate() declaration (fixes implicit int assumption)
 #include "hakmem_super_registry.h"
 #include "hakmem_tiny.h"
 #include "hakmem_tiny_config.h"
diff --git a/hakmem_super_registry.d b/hakmem_super_registry.d
index 9c99b253..5df4e887 100644
--- a/hakmem_super_registry.d
+++ b/hakmem_super_registry.d
@@ -6,7 +6,8 @@ hakmem_super_registry.o: core/hakmem_super_registry.c \
  core/superslab/../hakmem_tiny_superslab_constants.h \
  core/superslab/../hakmem_tiny_config.h core/tiny_debug_ring.h \
  core/hakmem_build_flags.h core/tiny_remote.h \
- core/hakmem_tiny_superslab_constants.h
+ core/hakmem_tiny_superslab_constants.h core/box/ss_allocation_box.h \
+ core/hakmem_tiny_superslab.h
 core/hakmem_super_registry.h:
 core/hakmem_tiny_superslab.h:
 core/superslab/superslab_types.h:
@@ -20,3 +21,5 @@ core/tiny_debug_ring.h:
 core/hakmem_build_flags.h:
 core/tiny_remote.h:
 core/hakmem_tiny_superslab_constants.h:
+core/box/ss_allocation_box.h:
+core/hakmem_tiny_superslab.h: