diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 1fdd184f78..becf51593e 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -545,8 +545,6 @@ static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
 	memcpy(to, from, n);
 }
 
-extern unsigned long x86_stack_size;
-
 static int load_aout_interp(void * exptr, int interp_fd);
 
 #ifdef BSWAP_NEEDED
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index a12cc9b693..a2abe51781 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -247,6 +247,9 @@ void mmap_fork_start(void);
 void mmap_fork_end(int child);
 #endif
 
+/* main.c */
+extern unsigned long x86_stack_size;
+
 /* user access */
 
 #define VERIFY_READ 0