diff --git a/include/pocketpy/config.h b/include/pocketpy/config.h
index a777ad11..cbdb8084 100644
--- a/include/pocketpy/config.h
+++ b/include/pocketpy/config.h
@@ -45,7 +45,10 @@
 #define PK_DEBUG_NO_MEMORY_POOL     0
 #define PK_DEBUG_NO_AUTO_GC         0
 #define PK_DEBUG_GC_STATS           0
+
+#ifndef PK_DEBUG_PRECOMPILED_EXEC
 #define PK_DEBUG_PRECOMPILED_EXEC   0
+#endif
 
 /*************** internal settings ***************/
 
diff --git a/run_tests.sh b/run_tests.sh
index d7264fff..6cba9243 100644
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -1,6 +1,6 @@
 python prebuild.py
 SRC=$(find src/ -name "*.cpp")
-clang++ -std=c++17 --coverage -O1 -stdlib=libc++ -frtti -Wfatal-errors -o main src2/main.cpp $SRC -Iinclude -DPK_ENABLE_OS=1
+clang++ -std=c++17 --coverage -O1 -stdlib=libc++ -frtti -Wfatal-errors -o main src2/main.cpp $SRC -Iinclude -DPK_ENABLE_OS=1 -DPK_DEBUG_PRECOMPILED_EXEC=1
 
 python scripts/run_tests.py