diff --git a/common/Makefile.am b/common/Makefile.am
index f44757c..918a268 100644
--- a/common/Makefile.am
+++ b/common/Makefile.am
@@ -4,5 +4,5 @@ AM_CXXFLAGS = -fno-rtti -fno-exceptions -fno-strict-aliasing
 
 libcommon_la_SOURCES = \
 	ca.cpp \
-	lt_debug.cpp \
+	lt_debug.c \
 	proc_tools.c
diff --git a/common/lt_debug.cpp b/common/lt_debug.c
similarity index 100%
rename from common/lt_debug.cpp
rename to common/lt_debug.c
diff --git a/common/lt_debug.h b/common/lt_debug.h
index 69a451a..4512bab 100644
--- a/common/lt_debug.h
+++ b/common/lt_debug.h
@@ -21,10 +21,16 @@
 #define HAL_DEBUG_RECORD	7
 #define HAL_DEBUG_ALL		((1<<8)-1)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 extern int debuglevel;
 
 void hal_set_threadname(const char *name);
 void _lt_debug(int facility, const void *, const char *fmt, ...) __attribute__ ((format (printf, 3, 4)));
 void _lt_info(int facility, const void *, const char *fmt, ...)  __attribute__ ((format (printf, 3, 4)));
 void lt_debug_init(void);
+#ifdef __cplusplus
+}
+#endif
 #endif