diff --git a/procname.c b/procname.c
index 7ee076e7..97a78d71 100644
--- a/procname.c
+++ b/procname.c
@@ -16,7 +16,8 @@
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <sys/param.h>
+#include <sys/param.h>	/* MAXCOMLEN */
+#include <sys/types.h>
 #include <sys/proc.h>
 #include <sys/sysctl.h>
 #include <sys/stat.h>