diff --git a/src/kernel/core/Jamfile b/src/kernel/core/Jamfile
index 67f2ec7b9f..e76dc22f6f 100644
--- a/src/kernel/core/Jamfile
+++ b/src/kernel/core/Jamfile
@@ -41,6 +41,7 @@ KernelMergeObject kernel_core.o :
 	team.c
 	thread.c
 	timer.c
+	user_debugger.cpp
 	: -fno-pic
 	;