diff --git a/litex/build/lattice/trellis.py b/litex/build/lattice/trellis.py
index 39793fc18..a3e5f9265 100644
--- a/litex/build/lattice/trellis.py
+++ b/litex/build/lattice/trellis.py
@@ -123,10 +123,10 @@ _build_template = [
     "yosys -l {build_name}.rpt {build_name}.ys",
     "nextpnr-ecp5 --json {build_name}.json --lpf {build_name}.lpf --textcfg {build_name}.config  \
     --{architecture} --package {package} --speed {speed_grade} {timefailarg} {ignoreloops} --seed {seed}",
-    "ecppack {build_name}.config --svf {build_name}.svf --bit {build_name}.bit --bootaddr {bootaddr} {spimode}"
+    "ecppack {build_name}.config --svf {build_name}.svf --bit {build_name}.bit --bootaddr {bootaddr} {spimode} {compress}"
 ]
 
-def _build_script(source, build_template, build_name, architecture, package, speed_grade, timingstrict, ignoreloops, bootaddr, seed, spimode):
+def _build_script(source, build_template, build_name, architecture, package, speed_grade, timingstrict, ignoreloops, bootaddr, seed, spimode, compress):
     if sys.platform in ("win32", "cygwin"):
         script_ext = ".bat"
         script_contents = "@echo off\nrem Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\n\n"
@@ -148,7 +148,8 @@ def _build_script(source, build_template, build_name, architecture, package, spe
             bootaddr        = bootaddr,
             fail_stmt       = fail_stmt,
             seed            = seed,
-            spimode         = "" if spimode is None else "--spimode {}".format(spimode))
+            spimode         = "" if spimode is None else "--spimode {}".format(spimode),
+            compress        = "" if not compress else "--compress")
 
     script_file = "build_" + build_name + script_ext
     tools.write_to_file(script_file, script_contents, force_unix=False)
@@ -203,6 +204,7 @@ class LatticeTrellisToolchain:
         bootaddr       = 0,
         seed           = 1,
         spimode        = None,
+        compress       = False,
         **kwargs):
 
         # Create build directory
@@ -234,7 +236,7 @@ class LatticeTrellisToolchain:
 
         # Generate build script
         script = _build_script(False, self.build_template, build_name, architecture, package,
-                               speed_grade, timingstrict, ignoreloops, bootaddr, seed, spimode)
+                               speed_grade, timingstrict, ignoreloops, bootaddr, seed, spimode, compress)
         # Run
         if run:
             _run_script(script)
@@ -266,6 +268,8 @@ def trellis_args(parser):
                         help="Set boot address for next image, i.e. pass '--bootaddr xxx' to ecppack")
     parser.add_argument("--ecppack-spimode", default=None,
                         help="Set slave SPI programming mode")
+    parser.add_argument("--ecppack-compress", action="store_true",
+                        help="Compress bitstream to reduce size")
     parser.add_argument("--nextpnr-seed", default=1, type=int,
                         help="seed to pass to nextpnr")
 
@@ -277,5 +281,6 @@ def trellis_argdict(args):
         "ignoreloops":  args.nextpnr_ignoreloops,
         "bootaddr":     args.ecppack_bootaddr,
         "spimode":      args.ecppack_spimode,
+        "compress":     args.ecppack_compress,
         "seed":         args.nextpnr_seed,
     }