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diff --git a/src/third_party/fast/fast.h b/src/third_party/fast/fast.h
index 2b3825a..06fa90e 100644
--- a/src/third_party/fast/fast.h
+++ b/src/third_party/fast/fast.h
@@ -1,6 +1,10 @@
#ifndef FAST_H
#define FAST_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
typedef struct { int x, y; } xy;
typedef unsigned char byte;
@@ -28,4 +32,8 @@ xy* fast12_detect_nonmax(const byte* im, int xsize, int ysize, int stride, int b
xy* nonmax_suppression(const xy* corners, const int* scores, int num_corners, int* ret_num_nonmax);
+#ifdef __cplusplus
+}
+#endif
+
#endif
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