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 152435bca9..2f2e6d3e7d 100644
--- a/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java
+++ b/core/src/main/java/org/lflang/generator/c/CCmakeGenerator.java
@@ -228,10 +228,15 @@ CodeBuilder generateCMakeCode(
         break;
       case PATMOS:
         cMakeCode.newLine();
+        cMakeCode.pr("SET(CMAKE_SYSTEM_NAME patmos)");
+        cMakeCode.pr("SET(CMAKE_SYSTEM_PROCESSOR patmos)");
         cMakeCode.pr("# Include toolchain file and set project");
         cMakeCode.pr(
             "find_program(CLANG_EXECUTABLE NAMES patmos-clang REQUIRED DOC \"Path to the clang"
                 + " front-end.\")");
+        cMakeCode.pr("set(CMAKE_C_FLAGS_INIT \"-O2 -DNDEBUG\")");
+        
+
         cMakeCode.pr("set(CMAKE_C_COMPILER ${CLANG_EXECUTABLE})");
         cMakeCode.pr(
             "set(CMAKE_C_FLAGS_RELEASE \"-O2 -DNDEBUG\")"); // patmos-clang cannot compiler -O3