diff --git a/core/src/main/java/org/lflang/generator/GeneratorBase.java b/core/src/main/java/org/lflang/generator/GeneratorBase.java
index d8b3d2d7d4..0713b863be 100644
--- a/core/src/main/java/org/lflang/generator/GeneratorBase.java
+++ b/core/src/main/java/org/lflang/generator/GeneratorBase.java
@@ -34,6 +34,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.emf.ecore.EObject;
@@ -227,7 +228,7 @@ public void doGenerate(Resource resource, LFGeneratorContext context) {
     // to validate, which happens in setResources().
     setReactorsAndInstantiationGraph(context.getMode());
 
-    List<Resource> allResources = GeneratorUtils.getResources(reactors);
+    Set<Resource> allResources = GeneratorUtils.getResources(reactors);
 
     GeneratorUtils.accommodatePhysicalActionsIfPresent(
         allResources,
@@ -413,7 +414,7 @@ protected void checkWatchdogSupport(boolean isSupported) {
    * Finds and transforms connections into forwarding reactions iff the connections have the same
    * destination as other connections or reaction in mutually exclusive modes.
    */
-  private void transformConflictingConnectionsInModalReactors(List<Resource> resources) {
+  private void transformConflictingConnectionsInModalReactors(Set<Resource> resources) {
     for (Resource r : resources) {
       var transform = ASTUtils.findConflictingConnectionsInModalReactors(r);
       if (!transform.isEmpty()) {
diff --git a/core/src/main/java/org/lflang/generator/GeneratorUtils.java b/core/src/main/java/org/lflang/generator/GeneratorUtils.java
index 77240613e6..bda5a5cf2e 100644
--- a/core/src/main/java/org/lflang/generator/GeneratorUtils.java
+++ b/core/src/main/java/org/lflang/generator/GeneratorUtils.java
@@ -1,8 +1,7 @@
 package org.lflang.generator;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
+import java.util.LinkedHashSet;
+import java.util.Set;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.CoreException;
@@ -13,6 +12,7 @@
 import org.lflang.generator.LFGeneratorContext.Mode;
 import org.lflang.lf.Action;
 import org.lflang.lf.ActionOrigin;
+import org.lflang.lf.ImportedReactor;
 import org.lflang.lf.Instantiation;
 import org.lflang.lf.Reactor;
 import org.lflang.lf.TargetDecl;
@@ -40,7 +40,7 @@ public static TargetDecl findTargetDecl(Resource resource) {
    * targetConfig}. This is a helper function for setTargetConfig. It should not be used elsewhere.
    */
   public static void accommodatePhysicalActionsIfPresent(
-      List<Resource> resources,
+      Set<Resource> resources,
       boolean setsKeepAliveOptionAutomatically,
       TargetConfig targetConfig,
       MessageReporter messageReporter) {
@@ -79,22 +79,33 @@ public static <T> Iterable<T> findAll(Resource resource, Class<T> nodeType) {
   }
 
   /**
-   * Return the resources that provide the given reactors.
+   * Return the resources that provide the given reactors and their ancestors.
    *
    * @param reactors The reactors for which to find containing resources.
    * @return the resources that provide the given reactors.
    */
-  public static List<Resource> getResources(Iterable<Reactor> reactors) {
-    HashSet<Resource> visited = new HashSet<>();
-    List<Resource> resources = new ArrayList<>();
+  public static Set<Resource> getResources(Iterable<Reactor> reactors) {
+    Set<Resource> visited = new LinkedHashSet<>();
     for (Reactor r : reactors) {
-      Resource resource = r.eResource();
-      if (!visited.contains(resource)) {
-        visited.add(resource);
-        resources.add(resource);
+      if (!visited.contains(r.eResource())) {
+        addInheritedResources(r, visited);
+      }
+    }
+    return visited;
+  }
+
+  /** Collect all resources associated with reactor through class inheritance. */
+  private static void addInheritedResources(Reactor reactor, Set<Resource> resources) {
+    resources.add(reactor.eResource());
+    for (var s : reactor.getSuperClasses()) {
+      if (!resources.contains(s)) {
+        if (s instanceof ImportedReactor i) {
+          addInheritedResources(i.getReactorClass(), resources);
+        } else if (s instanceof Reactor r) {
+          addInheritedResources(r, resources);
+        }
       }
     }
-    return resources;
   }
 
   /**
diff --git a/test/C/src/target/ImportedCMakeInclude.lf b/test/C/src/target/ImportedCMakeInclude.lf
new file mode 100644
index 0000000000..bc922d7429
--- /dev/null
+++ b/test/C/src/target/ImportedCMakeInclude.lf
@@ -0,0 +1,12 @@
+target C {
+  timeout: 1 ms
+}
+
+import Foo from "./CMakeInclude.lf"
+
+reactor Bar extends Foo {
+}
+
+main reactor {
+  r = new Foo()
+}