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-rw-r--r--src/fmt_fp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/fmt_fp.c b/src/fmt_fp.c
index 765690fce..9ee314760 100644
--- a/src/fmt_fp.c
+++ b/src/fmt_fp.c
@@ -1,3 +1,4 @@
+#include <mrbconf.h>
#ifndef MRB_NO_FLOAT
#if defined(MRB_NO_STDIO) || defined(_WIN32) || defined(_WIN64)
/*