diff --git a/core/src/main/java/org/lflang/federated/extensions/CExtensionUtils.java b/core/src/main/java/org/lflang/federated/extensions/CExtensionUtils.java
index 541ff67f74..ad982431a2 100644
--- a/core/src/main/java/org/lflang/federated/extensions/CExtensionUtils.java
+++ b/core/src/main/java/org/lflang/federated/extensions/CExtensionUtils.java
@@ -313,6 +313,7 @@ public static void generateCMakeInclude(
         "add_compile_definitions(LF_PACKAGE_DIRECTORY=\"" + fileConfig.srcPkgPath + "\")");
     cmakeIncludeCode.pr(
         "add_compile_definitions(LF_SOURCE_GEN_DIRECTORY=\"" + fileConfig.getSrcGenPath() + "\")");
+    cmakeIncludeCode.pr("add_compile_definitions(LF_FILE_SEPARATOR=\"" + File.separator + "\")");
     try (var srcWriter = Files.newBufferedWriter(cmakeIncludePath)) {
       srcWriter.write(cmakeIncludeCode.getCode());
     }
diff --git a/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java b/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java
index 283da8257f..c9420d2a00 100644
--- a/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java
+++ b/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java
@@ -333,8 +333,6 @@ CodeBuilder generateCMakeCode(
               }
               cMakeCode.pr("set(" + key + " " + v + " CACHE STRING \"\")\n");
             });
-    // Set default values for various build paths
-    cMakeCode.pr("set(LF_FILE_SEPARATOR=\"" + File.separator + "\" CACHE STRING \"\")");
     // Add trace-plugin data
     var tracePlugin = targetConfig.getOrDefault(TracePluginProperty.INSTANCE);
     System.out.println(tracePlugin);