diff --git a/ebos/eclproblem.hh b/ebos/eclproblem.hh
index 74ecf5d05..b42b64bff 100644
--- a/ebos/eclproblem.hh
+++ b/ebos/eclproblem.hh
@@ -3023,7 +3023,7 @@ private:
             for (const auto& bcface : bcconfig) {
                 const auto& type = bcface.bctype;
                 if (type == BCType::RATE) {
-                    int compIdx;
+                    int compIdx = 0;
 
                     switch (bcface.component) {
                     case BCComponent::OIL: