diff --git a/src/engine/Period.c b/src/engine/Period.c
index 8b28103f2f..f70060d5b1 100644
--- a/src/engine/Period.c
+++ b/src/engine/Period.c
@@ -26,7 +26,7 @@ Open questions: how do we deal with the backends ???
 #include "TransactionP.h"
 
 /* This static indicates the debugging module that this .o belongs to.  */
-static short module = MOD_ENGINE;
+static short module = MOD_BOOK;
 
 /* ================================================================ */
 /* Reparent transaction to new book.  This routine does this by 
diff --git a/src/engine/gnc-engine-util.c b/src/engine/gnc-engine-util.c
index 5e4abe32d5..08e70c2f4b 100644
--- a/src/engine/gnc-engine-util.c
+++ b/src/engine/gnc-engine-util.c
@@ -63,6 +63,7 @@ static gncLogLevel loglevel[MOD_LAST + 1] =
   GNC_LOG_WARNING,      /* SQL TXN */
   GNC_LOG_WARNING,      /* KVP */
   GNC_LOG_DEBUG,        /* SX */
+  GNC_LOG_WARNING,      /* BOOK */
 };
 
 static FILE *fout = NULL;
diff --git a/src/engine/gnc-engine-util.h b/src/engine/gnc-engine-util.h
index 7ae0fb5d85..57da9d2af0 100644
--- a/src/engine/gnc-engine-util.h
+++ b/src/engine/gnc-engine-util.h
@@ -61,7 +61,8 @@ typedef enum
   MOD_TXN     = 14,
   MOD_KVP     = 15,
   MOD_SX      = 16,
-  MOD_LAST    = 16
+  MOD_BOOK    = 17,
+  MOD_LAST    = 17
 } gncModuleType;
 
 typedef enum