diff --git a/mission/controller/acs/Guidance.cpp b/mission/controller/acs/Guidance.cpp
index 3b5d325c..12957ab2 100644
--- a/mission/controller/acs/Guidance.cpp
+++ b/mission/controller/acs/Guidance.cpp
@@ -424,7 +424,7 @@ void Guidance::comparePtg(double currentQuat[4], double currentSatRotRate[3], do
   // Convert target rotational rate into body RF
   double errorQuatInv[4] = {0, 0, 0, 0}, targetSatRotRateB[3] = {0, 0, 0};
   QuaternionOperations::inverse(errorQuat, errorQuatInv);
-  QuaternionOperations::multiplyVector(errorQuat, targetSatRotRate, targetSatRotRateB);
+  QuaternionOperations::multiplyVector(errorQuatInv, targetSatRotRate, targetSatRotRateB);
   // Combine the target and reference satellite rotational rates
   double combinedRefSatRotRate[3] = {0, 0, 0};
   VectorOperations<double>::add(targetSatRotRate, refSatRotRate, combinedRefSatRotRate, 3);