diff --git a/src/main/flight/imu.c b/src/main/flight/imu.c
index 33735d7c32..613c801cbf 100644
--- a/src/main/flight/imu.c
+++ b/src/main/flight/imu.c
@@ -99,7 +99,9 @@ static imuRuntimeConfig_t imuRuntimeConfig;
 
 float rMat[3][3];
 
+#if defined(USE_ACC)
 STATIC_UNIT_TESTED bool attitudeIsEstablished = false;
+#endif
 
 // quaternion of sensor frame relative to earth frame
 STATIC_UNIT_TESTED quaternion q = QUATERNION_INITIALIZE;