diff --git a/include/strlcat.h b/include/strlcat.h
index f3817268..d64462aa 100644
--- a/include/strlcat.h
+++ b/include/strlcat.h
@@ -3,6 +3,8 @@
 
 #include <sys/types.h>
 
+#ifndef HAVE_STRLCAT
 size_t strlcat(char *, const char *, size_t);
+#endif
 
 #endif
diff --git a/include/strlcpy.h b/include/strlcpy.h
index 887f175c..e0066b42 100644
--- a/include/strlcpy.h
+++ b/include/strlcpy.h
@@ -3,6 +3,8 @@
 
 #include <sys/types.h>
 
+#ifndef HAVE_STRLCPY
 size_t strlcpy(char *, const char *, size_t);
+#endif
 
 #endif