diff --git a/include/cglm/call/aabb2d.h b/include/cglm/call/aabb2d.h
index d35a36b..950607e 100644
--- a/include/cglm/call/aabb2d.h
+++ b/include/cglm/call/aabb2d.h
@@ -13,6 +13,9 @@ extern "C" {
 
 #include "../cglm.h"
 
+/* DEPRECATED! use _diag */
+#define glmc_aabb2d_size(aabb) glmc_aabb2d_diag(aabb)
+
 CGLM_EXPORT
 void
 glmc_aabb2d_zero(vec2 aabb[2]);
diff --git a/src/aabb2d.c b/src/aabb2d.c
index 2e3a3c2..2bace8f 100644
--- a/src/aabb2d.c
+++ b/src/aabb2d.c
@@ -8,9 +8,6 @@
 #include "../include/cglm/cglm.h"
 #include "../include/cglm/call.h"
 
-/* DEPRECATED! use _diag */
-#define glmc_aabb2d_size(aabb)         glmc_aabb2d_diag(aabb)
-
 CGLM_EXPORT
 void
 glmc_aabb2d_zero(vec2 aabb[2]) {