diff --git a/system/Makefile b/system/Makefile
index 3a08d75..83cf4e7 100644
--- a/system/Makefile
+++ b/system/Makefile
@@ -15,7 +15,7 @@
 #   You should have received a copy of the GNU General Public License
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-TOP_LEVEL_SOURCE=system.v
+TOP_LEVEL_SOURCE=system.v #TODO I really don't like this variable and its name
 SOURCES=processor.v memory.v registers.v alu.v decoder.v general.v biu.v execute.v
 EVENT_SIM_TESTBENCH=testbench.v
 VERILATOR_TESTBENCH=testbench.cpp
@@ -67,9 +67,9 @@ endif
 ECP5_TARGETS=synth_ecp5.json synth_ecp5_out.config synth_ecp5.bit synth_ecp5.dfu fpga_config/${FPGA_BOARD}/fpga_top.v
 ECP5_TARGETS+=abc.history # created from yosys
 
-synth_ecp5.json: ${SOURCES} ${TOP_LEVEL_SOURCE} ${INCLUDES} boot_code.txt
+synth_ecp5.json: ${SOURCES} ${TOP_LEVEL_SOURCE} fpga_config/${FPGA_BOARD}/fpga_top.v ${INCLUDES} boot_code.txt
 	${QUIET_YOSYS}
-	${Q} yosys -q -p 'read -sv '"${SOURCES} ${TOP_LEVEL_SOURCE} ; synth_ecp5 -json $@"
+	${Q} yosys -q -p 'read -sv '"${SOURCES} ${TOP_LEVEL_SOURCE} fpga_config/${FPGA_BOARD}/fpga_top.v ; synth_ecp5 -json $@"
 
 synth_ecp5_out.config:synth_ecp5.json
 	${QUIET_NEXTPNR}
diff --git a/system/fpga_config/OrangeCrab_r0.2.1/fpga_top.v b/system/fpga_config/OrangeCrab_r0.2.1/fpga_top.v
index 52fdfb8..4a721f2 100644
--- a/system/fpga_config/OrangeCrab_r0.2.1/fpga_top.v
+++ b/system/fpga_config/OrangeCrab_r0.2.1/fpga_top.v
@@ -22,19 +22,20 @@
 module fpga_top(
 	input clk48,
 
-	input user_button;
-	output reset_n;
+	input user_button,
+	output reset_n,
 
-	output reg rgb_led0_r;
-	output reg rgb_led0_g;
-	output reg rgb_led0_b;
+	output reg rgb_led0_r,
+	output reg rgb_led0_g,
+	output reg rgb_led0_b,
 );
 
-wire HALT,[`ERROR_BITS-1:0]ERROR;
+wire HALT;
+wire [`ERROR_BITS-1:0]ERROR;
 system system(
 	/*     MISC    */ clk48,user_button,HALT,ERROR
 	/* MEMORY / IO */ ,address_bus,data_bus,rd,wr,BHE,IOMEM
-)
+);
 
 always @(HALT or ERROR or user_button) begin
 	if (HALT==0) begin
@@ -53,3 +54,5 @@ always @(HALT or ERROR or user_button) begin
 		rgb_led_b=1;
 	end
 end
+
+endmodule