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-rw-r--r--libguile/chars.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/chars.c b/libguile/chars.c
index 9bd601599..5c78a5169 100644
--- a/libguile/chars.c
+++ b/libguile/chars.c
@@ -29,6 +29,7 @@
#include <unictype.h>
#include "libguile/_scm.h"
+#include "libguile/boolean.h"
#include "libguile/chars.h"
#include "libguile/srfi-14.h"