diff --git a/src/osdep/dos/Makefile b/src/osdep/dos/Makefile
index afd85cdc..7c37c345 100644
--- a/src/osdep/dos/Makefile
+++ b/src/osdep/dos/Makefile
@@ -1,6 +1,6 @@
 top_builddir=../../..
 include $(top_builddir)/Makefile.config
 
-OBJS = dos.obj
+OBJS = dos.o
 
 include $(top_srcdir)/Makefile.lib
diff --git a/src/osdep/dos/dos.cpp b/src/osdep/dos/dos.c
similarity index 100%
rename from src/osdep/dos/dos.cpp
rename to src/osdep/dos/dos.c
diff --git a/src/osdep/dos/meson.build b/src/osdep/dos/meson.build
index 7236fce4..20ebbe89 100644
--- a/src/osdep/dos/meson.build
+++ b/src/osdep/dos/meson.build
@@ -2,4 +2,4 @@ configure_file(input : 'elinks.lsm.in',
                output : 'elinks.lsm',
                configuration : conf_data)
 
-srcs += files('dos.cpp')
+srcs += files('dos.c')