diff --git a/test/packet_tool/CMakeLists.txt b/test/packet_tool/CMakeLists.txt
index bde3fd5..54b1207 100644
--- a/test/packet_tool/CMakeLists.txt
+++ b/test/packet_tool/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_executable(packet_tool packet_tool.cpp)
+add_executable(packet_tool packet_tool.c)
 target_link_libraries(packet_tool packet pcap)
 
 file(COPY split_pcap.sh DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
diff --git a/test/packet_tool/packet_tool.cpp b/test/packet_tool/packet_tool.c
similarity index 100%
rename from test/packet_tool/packet_tool.cpp
rename to test/packet_tool/packet_tool.c