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-rw-r--r--FL/fl_casts.H5
1 files changed, 5 insertions, 0 deletions
diff --git a/FL/fl_casts.H b/FL/fl_casts.H
index 1d0d881cd..cb9a708db 100644
--- a/FL/fl_casts.H
+++ b/FL/fl_casts.H
@@ -15,6 +15,9 @@
// https://www.fltk.org/bugs.php
//
+#ifndef _FL_fl_casts_H_
+#define _FL_fl_casts_H_
+
#include <FL/platform_types.h>
inline char fl_char(void *v) { return (char)(fl_intptr_t)v; }
@@ -32,3 +35,5 @@ inline void *fl_voidptr(int v) { return (void *)(fl_intptr_t)v; }
inline void *fl_voidptr(unsigned int v) { return (void *)(fl_uintptr_t)v; }
inline void *fl_voidptr(long v) { return (void *)(fl_intptr_t)v; }
inline void *fl_voidptr(unsigned long v) { return (void *)(fl_uintptr_t)v; }
+
+#endif /* _FL_fl_casts_H_ */