diff --git a/nmigen/vendor/lattice_ecp5.py b/nmigen/vendor/lattice_ecp5.py
index 3affa8f..2a68dad 100644
--- a/nmigen/vendor/lattice_ecp5.py
+++ b/nmigen/vendor/lattice_ecp5.py
@@ -122,6 +122,7 @@ class LatticeECP5Platform(TemplatedPlatform):
                 read_ilang {{file}}
             {% endfor %}
             read_ilang {{name}}.il
+            delete w:$verilog_initial_trigger
             {{get_override("script_after_read")|default("# (script_after_read placeholder)")}}
             synth_ecp5 {{get_override("synth_opts")|options}} -top {{name}}
             {{get_override("script_after_synth")|default("# (script_after_synth placeholder)")}}
diff --git a/nmigen/vendor/lattice_ice40.py b/nmigen/vendor/lattice_ice40.py
index d5e4dd6..4e6b282 100644
--- a/nmigen/vendor/lattice_ice40.py
+++ b/nmigen/vendor/lattice_ice40.py
@@ -124,6 +124,7 @@ class LatticeICE40Platform(TemplatedPlatform):
                 read_ilang {{file}}
             {% endfor %}
             read_ilang {{name}}.il
+            delete w:$verilog_initial_trigger
             {{get_override("script_after_read")|default("# (script_after_read placeholder)")}}
             synth_ice40 {{get_override("synth_opts")|options}} -top {{name}}
             {{get_override("script_after_synth")|default("# (script_after_synth placeholder)")}}