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-rw-r--r--gnuradio-core/src/lib/runtime/gr_top_block.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_top_block.cc b/gnuradio-core/src/lib/runtime/gr_top_block.cc
index 10e377205..b2523afc9 100644
--- a/gnuradio-core/src/lib/runtime/gr_top_block.cc
+++ b/gnuradio-core/src/lib/runtime/gr_top_block.cc
@@ -24,6 +24,7 @@
#include "config.h"
#endif
+#include <unistd.h>
#include <gr_top_block.h>
#include <gr_top_block_impl.h>
#include <gr_io_signature.h>