diff --git a/compiler/cpp/src/logging.h b/compiler/cpp/src/logging.h
index 3f1fce8..ebefbf2 100644
--- a/compiler/cpp/src/logging.h
+++ b/compiler/cpp/src/logging.h
@@ -20,7 +20,9 @@
 #ifndef T_LOGGING_H
 #define T_LOGGING_H
 
-#include <string>
+extern int g_debug;
+extern int g_warn;
+extern int g_verbose;
 
 /**
  * Parse debugging output, used to print helpful info