diff --git a/mission/controller/acs/util/MathOperations.h b/mission/controller/acs/util/MathOperations.h
index 56665c4d..b8d1fa4d 100644
--- a/mission/controller/acs/util/MathOperations.h
+++ b/mission/controller/acs/util/MathOperations.h
@@ -279,7 +279,7 @@ class MathOperations {
   }
   static void inverseMatrixDimThree(const T1 *matrix, T1 *output) {
     int i, j;
-    double determinant;
+    double determinant = 0;
     double mat[3][3] = {{matrix[0], matrix[1], matrix[2]},
                         {matrix[3], matrix[4], matrix[5]},
                         {matrix[6], matrix[7], matrix[8]}};