diff --git a/projects/scripts/project-xilinx.mk b/projects/scripts/project-xilinx.mk
index 64fe73a9e..0bc4a2585 100644
--- a/projects/scripts/project-xilinx.mk
+++ b/projects/scripts/project-xilinx.mk
@@ -27,6 +27,7 @@ CLEAN_TARGET += *.str
 CLEAN_TARGET += mem_init_sys.txt
 CLEAN_TARGET += *.csv
 CLEAN_TARGET += *.hbs
+CLEAN_TARGET += *.gen
 
 # Common dependencies that all projects have
 M_DEPS += system_project.tcl