diff --git a/config.tests/unix/mtdev/mtdev.c b/config.tests/unix/mtdev/mtdev.cpp
similarity index 100%
rename from config.tests/unix/mtdev/mtdev.c
rename to config.tests/unix/mtdev/mtdev.cpp
diff --git a/config.tests/unix/mtdev/mtdev.pro b/config.tests/unix/mtdev/mtdev.pro
index 4555bf416c..4c7f76c89f 100644
--- a/config.tests/unix/mtdev/mtdev.pro
+++ b/config.tests/unix/mtdev/mtdev.pro
@@ -1,4 +1,4 @@
-SOURCES = mtdev.c
+SOURCES = mtdev.cpp
 
 CONFIG += link_pkgconfig
 PKGCONFIG_PRIVATE += mtdev