diff --git a/src/engine/engine_io.c b/src/engine/engine_io.c
index 6c348b25..f4f8c79d 100644
--- a/src/engine/engine_io.c
+++ b/src/engine/engine_io.c
@@ -308,6 +308,15 @@ static void bufread(void* dest, int num, int szbuf, const void* buf, int* ptrbuf
 
 
 
+// number of bytes to be skipped to achieve 64-byte alignment
+static inline unsigned int SKIP(intptr_t offset) {
+  const unsigned int align = 64;
+  // compute skipped bytes
+  return (align - (offset % align)) % align;
+}
+
+
+
 //----------------------------------- mjModel construction -----------------------------------------
 
 // set pointers in mjModel buffer
diff --git a/src/engine/engine_macro.h b/src/engine/engine_macro.h
index 3ad6dca6..d9086197 100644
--- a/src/engine/engine_macro.h
+++ b/src/engine/engine_macro.h
@@ -73,11 +73,4 @@
 
 #define PTRDIFF(x, y) ((char*)(x) - (char*)(y))
 
-// number of bytes to be skipped to achieve 64-byte alignment
-static inline unsigned int SKIP(intptr_t offset) {
-  const unsigned int align = 64;
-  // compute skipped bytes
-  return (align - (offset % align)) % align;
-}
-
 #endif  // MUJOCO_SRC_ENGINE_ENGINE_MACRO_H_