diff --git a/sources/pvmp3dec/CMakeLists.txt b/sources/pvmp3dec/CMakeLists.txt
index 6098d32a..bf84a3fc 100644
--- a/sources/pvmp3dec/CMakeLists.txt
+++ b/sources/pvmp3dec/CMakeLists.txt
@@ -58,10 +58,13 @@ target_include_directories(pvmp3dec PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/include
 )
 
-file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pvmp3dec_tmp_def.h "#pragma once\n#define OSCL_UNUSED_ARG(x) (void)(x)")
+if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/pvmp3dec_tmp_def.h)
+    file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pvmp3dec_tmp_def.h "#pragma once\n#define OSCL_UNUSED_ARG(x) (void)(x)")
+endif()
 
 target_compile_options(pvmp3dec PRIVATE 
     #-fsanitize=signed-integer-overflow
     -include ${CMAKE_CURRENT_BINARY_DIR}/pvmp3dec_tmp_def.h
    #
-)
\ No newline at end of file
+)
+