diff --git a/unixpwd/c/unixpwd_stubs.c b/unixpwd/c/unixpwd_stubs.c
index 45ef8cf7a37..1b173e1d439 100644
--- a/unixpwd/c/unixpwd_stubs.c
+++ b/unixpwd/c/unixpwd_stubs.c
@@ -28,7 +28,7 @@ CAMLprim        value
 caml_unixpwd_getpwd(value caml_user)
 {
     CAMLparam1(caml_user);
-    const char           *user;
+    const char     *user;
     char           *passwd;
     CAMLlocal1(pw);
 
@@ -48,7 +48,7 @@ CAMLprim        value
 caml_unixpwd_getspw(value caml_user)
 {
     CAMLparam1(caml_user);
-    const char           *user;
+    const char     *user;
     char           *passwd;
     CAMLlocal1(pw);
 
@@ -70,7 +70,7 @@ CAMLprim        value
 caml_unixpwd_get(value caml_user)
 {
     CAMLparam1(caml_user);
-    const char           *user;
+    const char     *user;
     char           *passwd;
     CAMLlocal1(pw);