diff --git a/lib/libc/gen/closedir.c b/lib/libc/gen/closedir.c
index 7e595e5c409e..3a4fc9de8bd2 100644
--- a/lib/libc/gen/closedir.c
+++ b/lib/libc/gen/closedir.c
@@ -53,8 +53,8 @@ closedir(dirp)
 	fd = dirp->dd_fd;
 	dirp->dd_fd = -1;
 	dirp->dd_loc = 0;
-	(void)free((void *)dirp->dd_buf);
-	(void)free((void *)dirp);
+	free((void *)dirp->dd_buf);
+	free((void *)dirp);
 	_reclaim_telldir(dirp);
 	return(close(fd));
 }
diff --git a/lib/libc/gen/getcwd.c b/lib/libc/gen/getcwd.c
index 2757d3b52b8e..fbd445d7dcca 100644
--- a/lib/libc/gen/getcwd.c
+++ b/lib/libc/gen/getcwd.c
@@ -128,7 +128,7 @@ getcwd(pt, size)
 			 * path to the beginning of the buffer, but it's always
 			 * been that way and stuff would probably break.
 			 */
-			(void)bcopy(bpt, pt, ept - bpt);
+			bcopy(bpt, pt, ept - bpt);
 			free(up);
 			return (pt);
 		}
@@ -204,7 +204,7 @@ getcwd(pt, size)
 				goto err;
 			bpt = pt + off;
 			ept = pt + ptsize;
-			(void)bcopy(bpt, ept - len, len);
+			bcopy(bpt, ept - len, len);
 			bpt = ept - len;
 		}
 		if (!first)
diff --git a/lib/libc/gen/getttyent.c b/lib/libc/gen/getttyent.c
index f9b1e0d85477..83f97e8b96e5 100644
--- a/lib/libc/gen/getttyent.c
+++ b/lib/libc/gen/getttyent.c
@@ -178,7 +178,7 @@ setttyent()
 {
 
 	if (tf) {
-		(void)rewind(tf);
+		rewind(tf);
 		return (1);
 	} else if (tf = fopen(_PATH_TTYS, "r"))
 		return (1);
diff --git a/lib/libc/gen/popen.c b/lib/libc/gen/popen.c
index 4affdf4ae0a4..0b8bda554ca9 100644
--- a/lib/libc/gen/popen.c
+++ b/lib/libc/gen/popen.c
@@ -71,7 +71,7 @@ popen(program, type)
 		return (NULL);
 
 	if (pipe(pdes) < 0) {
-		(void)free(cur);
+		free(cur);
 		return (NULL);
 	}
 
@@ -79,7 +79,7 @@ popen(program, type)
 	case -1:			/* Error. */
 		(void)close(pdes[0]);
 		(void)close(pdes[1]);
-		(void)free(cur);
+		free(cur);
 		return (NULL);
 		/* NOTREACHED */
 	case 0:				/* Child. */