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-rw-r--r--gnuradio-core/src/lib/runtime/gr_top_block_impl.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_top_block_impl.cc b/gnuradio-core/src/lib/runtime/gr_top_block_impl.cc
index 7a993a759..aa9368e4c 100644
--- a/gnuradio-core/src/lib/runtime/gr_top_block_impl.cc
+++ b/gnuradio-core/src/lib/runtime/gr_top_block_impl.cc
@@ -33,6 +33,7 @@
#include <stdexcept>
#include <iostream>
#include <string.h>
+#include <unistd.h>
#define GR_TOP_BLOCK_IMPL_DEBUG 0