diff --git a/parse.yacc b/parse.yacc
index 77bab2976..731274870 100644
--- a/parse.yacc
+++ b/parse.yacc
@@ -511,7 +511,7 @@ cmndalias	:	ALIAS {
 				in_alias = TRUE;
 				/* Allocate space for ga_list if necesary. */
 				expand_ga_list();
-				if (!(ga_list[ga_list_len-1].alias = strdup($1))){
+				if (!(ga_list[ga_list_len-1].alias = (char *) strdup($1))){
 				    (void) fprintf(stderr,
 				      "%s: cannot allocate memory!\n", Argv[0]);
 				    exit(1);
@@ -544,7 +544,7 @@ runasalias	:	ALIAS {
 				in_alias = TRUE;
 				/* Allocate space for ga_list if necesary. */
 				expand_ga_list();
-				if (!(ga_list[ga_list_len-1].alias = strdup($1))){
+				if (!(ga_list[ga_list_len-1].alias = (char *) strdup($1))){
 				    (void) fprintf(stderr,
 				      "%s: cannot allocate memory!\n", Argv[0]);
 				    exit(1);
diff --git a/sudo.c b/sudo.c
index 898f505ac..260c35abd 100644
--- a/sudo.c
+++ b/sudo.c
@@ -560,7 +560,7 @@ static void load_globals(sudo_mode)
      */
     if ((p = strchr(host, '.'))) {
 	*p = '\0';
-	if ((shost = strdup(host)) == NULL) {
+	if ((shost = (char *) strdup(host)) == NULL) {
 	    (void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
 	    exit(1);
 	}
diff --git a/testsudoers.c b/testsudoers.c
index af26c6253..d1b4c2ea3 100644
--- a/testsudoers.c
+++ b/testsudoers.c
@@ -293,7 +293,7 @@ int main(argc, argv)
 
     if ((p = strchr(host, '.'))) {
 	*p = '\0';
-	if ((shost = strdup(host)) == NULL) {
+	if ((shost = (char *) strdup(host)) == NULL) {
 	    (void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
 	    exit(1);
 	}