diff --git a/libmisc/shell.c b/libmisc/shell.c
index 29724063..7c67500d 100644
--- a/libmisc/shell.c
+++ b/libmisc/shell.c
@@ -45,7 +45,7 @@ int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
 	 * don't want to tell us what it is themselves.
 	 */
 	if (arg == (char *) 0) {
-		(void) snprintf (arg0, sizeof arg0, "-%s", Basename ((char *) file));
+		(void) snprintf (arg0, sizeof arg0, "-%s", Basename (file));
 		arg0[sizeof arg0 - 1] = '\0';
 		arg = arg0;
 	}
diff --git a/src/newgrp.c b/src/newgrp.c
index cb88f6d7..99820832 100644
--- a/src/newgrp.c
+++ b/src/newgrp.c
@@ -379,7 +379,7 @@ int main (int argc, char **argv)
 	int err = 0;
 	gid_t gid;
 	char *cp;
-	char *progbase;
+	const char *progbase;
 	const char *name, *prog;
 	char *group = NULL;
 	char *command = NULL;
@@ -787,7 +787,7 @@ int main (int argc, char **argv)
 	 * Now I try to find the basename of the login shell. This will
 	 * become argv[0] of the spawned command.
 	 */
-	progbase = (char *) Basename ((char *) prog);
+	progbase = Basename (prog);
 
 	/*
 	 * Switch back to her home directory if i am doing login