diff --git a/bin/su/su.c b/bin/su/su.c
index adacfe8..6603277 100644
--- a/bin/su/su.c
+++ b/bin/su/su.c
@@ -31,13 +31,14 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/bin/su/su.c#10 $
+ * $P4: //depot/projects/openpam/bin/su/su.c#11 $
  */
 
 #include <sys/param.h>
 #include <sys/wait.h>
 
 #include <err.h>
+#include <grp.h>
 #include <pwd.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/lib/openpam_borrow_cred.c b/lib/openpam_borrow_cred.c
index 6bc84d4..a320fdd 100644
--- a/lib/openpam_borrow_cred.c
+++ b/lib/openpam_borrow_cred.c
@@ -31,11 +31,12 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#5 $
+ * $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#6 $
  */
 
 #include <sys/param.h>
 
+#include <grp.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <unistd.h>
diff --git a/lib/openpam_restore_cred.c b/lib/openpam_restore_cred.c
index 7558bda..9bba368 100644
--- a/lib/openpam_restore_cred.c
+++ b/lib/openpam_restore_cred.c
@@ -31,11 +31,12 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $P4: //depot/projects/openpam/lib/openpam_restore_cred.c#5 $
+ * $P4: //depot/projects/openpam/lib/openpam_restore_cred.c#6 $
  */
 
 #include <sys/param.h>
 
+#include <grp.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <unistd.h>