diff --git a/find_path.c b/find_path.c
index b5d109425..a23b2b0c9 100644
--- a/find_path.c
+++ b/find_path.c
@@ -61,6 +61,9 @@ extern char *getcwd();
 #else
 extern char *getwd();
 #endif
+#ifndef NEED_STRDUP
+extern char *strdup();
+#endif
 
 
 /*******************************************************************
diff --git a/sudo.c b/sudo.c
index 2952a3748..9f9ae7a18 100644
--- a/sudo.c
+++ b/sudo.c
@@ -55,6 +55,9 @@
 #include <sys/param.h>
 #include "sudo.h"
 extern char *malloc();
+#ifndef NEED_STRDUP
+extern char *strdup();
+#endif
 
 int Argc;
 char **Argv;