diff --git a/host/hackrf-tools/src/hackrf_sweep.c b/host/hackrf-tools/src/hackrf_sweep.c
index 826589f95..9acb5f5e0 100644
--- a/host/hackrf-tools/src/hackrf_sweep.c
+++ b/host/hackrf-tools/src/hackrf_sweep.c
@@ -47,6 +47,7 @@ typedef int bool;
 #ifdef _WIN32
 	#define _USE_MATH_DEFINES
 	#include <windows.h>
+	#include <io.h>
 	#ifdef _MSC_VER
 
 		#ifdef _WIN64