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-rw-r--r--libguile/threads.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/threads.c b/libguile/threads.c
index 5f8586a50..0e04af3cb 100644
--- a/libguile/threads.c
+++ b/libguile/threads.c
@@ -42,6 +42,7 @@
#include <gc/gc_mark.h>
#include "libguile/_scm.h"
+#include "libguile/boolean.h"
#include "libguile/deprecation.h"
#include "libguile/extensions.h"
#include "libguile/hashtab.h"