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-rw-r--r--src/Fl_Text_Display.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index f123d8e11..a0904c07d 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -41,6 +41,7 @@
#define ASSERT_UTF8
#ifdef ASSERT_UTF8
+#include <assert.h>
#define IS_UTF8_ALIGNED(a) if (a && *a) assert(fl_utf8len(*(a))>0);
#else
#define IS_UTF8_ALIGNED(a)