diff --git a/pyodide_build/pywasmcross.py b/pyodide_build/pywasmcross.py
index 66e4af110..3ddcfc4dd 100755
--- a/pyodide_build/pywasmcross.py
+++ b/pyodide_build/pywasmcross.py
@@ -299,6 +299,9 @@ def handle_command(line, args, dryrun=False):
         # threading is disabled for now
         if arg == "-pthread":
             continue
+        # this only applies to compiling fortran code, but we already f2c'd
+        if arg == "-ffixed-form":
+            continue
         # On Mac, we need to omit some darwin-specific arguments
         if arg in ["-bundle", "-undefined", "dynamic_lookup"]:
             continue