diff --git a/src/test/unit/blackbox_unittest.cc b/src/test/unit/blackbox_unittest.cc
index a873ed2014..63928107c4 100644
--- a/src/test/unit/blackbox_unittest.cc
+++ b/src/test/unit/blackbox_unittest.cc
@@ -20,6 +20,8 @@
 extern "C" {
     #include "platform.h"
 
+    #include "build/debug.h"
+
     #include "blackbox/blackbox.h"
     #include "common/utils.h"
 
@@ -362,7 +364,8 @@ uint8_t armingFlags;
 uint8_t stateFlags;
 const uint32_t baudRates[] = {0, 9600, 19200, 38400, 57600, 115200, 230400, 250000,
         400000, 460800, 500000, 921600, 1000000, 1500000, 2000000, 2470000}; // see baudRate_e
-uint8_t debugMode;
+uint8_t debugMode = 0;
+int16_t debug[DEBUG16_VALUE_COUNT];
 int32_t blackboxHeaderBudget;
 gpsSolutionData_t gpsSol;
 int32_t GPS_home[2];