diff --git a/include/inviwo/core/network/lambdanetworkvisitor.h b/include/inviwo/core/network/lambdanetworkvisitor.h
index 0f859ab4d72..9a05b5bd77e 100644
--- a/include/inviwo/core/network/lambdanetworkvisitor.h
+++ b/include/inviwo/core/network/lambdanetworkvisitor.h
@@ -75,16 +75,16 @@ struct LambdaNetworkVisitor : NetworkVisitor, Funcs... {
 
     virtual bool visit([[maybe_unused]] Processor& processor) override {
         if constexpr (util::is_detected_exact_v<bool, ProcessorOverload, decltype(*this)>) {
-            return operator()(processor);
+            return this->operator()(processor);
         } else {
             return true;
         }
     }
     virtual bool visit([[maybe_unused]] CanvasProcessor& processor) override {
         if constexpr (util::is_detected_exact_v<bool, CanvasProcessorOverload, decltype(*this)>) {
-            return operator()(processor);
+            return this->operator()(processor);
         } else if constexpr (util::is_detected_exact_v<bool, ProcessorOverload, decltype(*this)>) {
-            return operator()(processor);
+            return this->operator()(processor);
         } else {
             return true;
         }
@@ -92,16 +92,16 @@ struct LambdaNetworkVisitor : NetworkVisitor, Funcs... {
 
     virtual bool visit([[maybe_unused]] Property& property) override {
         if constexpr (util::is_detected_exact_v<bool, PropertyOverload, decltype(*this)>) {
-            return operator()(property);
+            return this->operator()(property);
         } else {
             return true;
         }
     }
     virtual bool visit([[maybe_unused]] CompositeProperty& compositeProperty) override {
         if constexpr (util::is_detected_exact_v<bool, CompositePropertyOverload, decltype(*this)>) {
-            return operator()(compositeProperty);
+            return this->operator()(compositeProperty);
         } else if constexpr (util::is_detected_exact_v<bool, PropertyOverload, decltype(*this)>) {
-            return operator()(compositeProperty);
+            return this->operator()(compositeProperty);
         } else {
             return true;
         }
diff --git a/include/inviwo/core/resourcemanager/resourcemanagerobserver.h b/include/inviwo/core/resourcemanager/resourcemanagerobserver.h
index 5a581a79ebe..7a139965db5 100644
--- a/include/inviwo/core/resourcemanager/resourcemanagerobserver.h
+++ b/include/inviwo/core/resourcemanager/resourcemanagerobserver.h
@@ -29,6 +29,7 @@
 
 #pragma once
 
+#include <string>
 #include <inviwo/core/common/inviwocoredefine.h>
 #include <inviwo/core/util/observer.h>