diff --git a/litex/build/lattice/icestorm.py b/litex/build/lattice/icestorm.py
index 1336acb20..55b46692e 100644
--- a/litex/build/lattice/icestorm.py
+++ b/litex/build/lattice/icestorm.py
@@ -56,6 +56,9 @@ def _yosys_import_sources(platform):
     for path in platform.verilog_include_paths:
         includes += " -I" + path
     for filename, language, library in platform.sources:
+        # yosys has no such function read_systemverilog
+        if language == "systemverilog":
+            language = "verilog -sv"
         reads.append("read_{}{} {}".format(
             language, includes, filename))
     return "\n".join(reads)
@@ -235,4 +238,4 @@ def icestorm_argdict(args):
         "timingstrict": args.nextpnr_timingstrict,
         "ignoreloops":  args.nextpnr_ignoreloops,
         "seed":         args.nextpnr_seed,
-    }
\ No newline at end of file
+    }
diff --git a/litex/build/lattice/oxide.py b/litex/build/lattice/oxide.py
index 145eca7d2..3c9a8cfb5 100644
--- a/litex/build/lattice/oxide.py
+++ b/litex/build/lattice/oxide.py
@@ -37,6 +37,9 @@ def _yosys_import_sources(platform):
     for path in platform.verilog_include_paths:
         includes += " -I" + path
     for filename, language, library in platform.sources:
+        # yosys has no such function read_systemverilog
+        if language == "systemverilog":
+            language = "verilog -sv"
         reads.append("read_{}{} {}".format(
             language, includes, filename))
     return "\n".join(reads)
diff --git a/litex/build/lattice/trellis.py b/litex/build/lattice/trellis.py
index a3e5f9265..a239d774b 100644
--- a/litex/build/lattice/trellis.py
+++ b/litex/build/lattice/trellis.py
@@ -67,6 +67,9 @@ def _yosys_import_sources(platform):
     for path in platform.verilog_include_paths:
         includes += " -I" + path
     for filename, language, library in platform.sources:
+        # yosys has no such function read_systemverilog
+        if language == "systemverilog":
+            language = "verilog -sv"
         reads.append("read_{}{} {}".format(
             language, includes, filename))
     return "\n".join(reads)