diff --git a/common/lib/log_legacy.cpp b/common/lib/log_legacy.cpp
index cb674c288..9e0f42ed7 100644
--- a/common/lib/log_legacy.cpp
+++ b/common/lib/log_legacy.cpp
@@ -28,10 +28,12 @@
 #include <villas/log.hpp>
 
 #pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result" 
+#pragma GCC diagnostic ignored "-Wunused-result"
 
 using namespace villas;
 
+extern "C" {
+
 int log_get_width()
 {
 	return logging.getWidth();
@@ -149,4 +151,6 @@ void jerror(json_error_t *err, const char *fmt, ...)
 	pause();
 }
 
+}
+
 #pragma GCC diagnostic pop