diff --git a/lib/filter/src/fir_stage_sys.vhd b/lib/filter/src/fir_stage_sys.vhd
index 7a3b240..bf381a0 100644
--- a/lib/filter/src/fir_stage_sys.vhd
+++ b/lib/filter/src/fir_stage_sys.vhd
@@ -84,6 +84,7 @@ signal prod : sfixed(shi(nbits_out, nbits_out_frac) downto slo(nbits_out, nbits_
 begin
 
 	assert input_latency >= min_input_lat report "Input latency must be greater than " & natural'image(min_input_lat-1) & "!" severity failure;
+	assert coef_latency >= min_input_lat report "Coeff. latency must be greater than " & natural'image(min_input_lat-1) & "!" severity failure;
 	assert pipe_latency >= min_pipe_lat report "Pipe latency must be greater than " & natural'image(min_pipe_lat-1) & "!" severity failure;
 
 	prod		<= mult_pipe(mult_latency);