diff --git a/linux-user/main.c b/linux-user/main.c
index 83dced350a..145bbed6da 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -655,6 +655,7 @@ int libafl_qemu_run(void)
 //// --- End LibAFL code ---
 
 #ifdef AS_LIB
+int qemu_user_init(int argc, char **argv, char **envp);
 int qemu_user_init(int argc, char **argv, char **envp)
 #else
 int main(int argc, char **argv, char **envp)