diff --git a/lib/openpam_log.c b/lib/openpam_log.c
index 65b2dc0..1beb659 100644
--- a/lib/openpam_log.c
+++ b/lib/openpam_log.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/lib/openpam_log.c#9 $
+ * $P4: //depot/projects/openpam/lib/openpam_log.c#10 $
  */
 
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <syslog.h>
 
 #include <security/pam_appl.h>