diff --git a/nisaba/brahmic/BUILD.bazel b/nisaba/brahmic/BUILD.bazel
index 330159a0..47948ec1 100644
--- a/nisaba/brahmic/BUILD.bazel
+++ b/nisaba/brahmic/BUILD.bazel
@@ -64,10 +64,6 @@ nisaba_grm_regression_test(
 
 nisaba_compile_multi_grm_py(
     name = "fixed",
-    outs = {
-        "byte": "fixed.far",
-        "utf8": "fixed_utf8.far",
-    },
     data = [":sigma_utf8.far"] + [
         "//nisaba/brahmic/data/script/{}:fixed.tsv".format(script)
         for script in FIXED_RULE_SCRIPTS
@@ -90,10 +86,6 @@ nisaba_grm_regression_test(
 
 nisaba_compile_multi_grm_py(
     name = "nfc",
-    outs = {
-        "byte": "nfc.far",
-        "utf8": "nfc_utf8.far",
-    },
     data = [
         ":sigma_utf8.far",
     ] + ["//nisaba/brahmic/data/script/{}:nfc.tsv".format(script) for script in SCRIPTS],
@@ -235,10 +227,6 @@ py_test(
 
 nisaba_compile_multi_grm_py(
     name = "visual_norm",
-    outs = {
-        "byte": "visual_norm.far",
-        "utf8": "visual_norm_utf8.far",
-    },
     data = [
         ":nfc.far",
         ":nfc_utf8.far",
@@ -288,10 +276,6 @@ nisaba_grm_regression_test(
 
 nisaba_compile_multi_grm_py(
     name = "wellformed",
-    outs = {
-        "byte": "wellformed.far",
-        "utf8": "wellformed_utf8.far",
-    },
     data = [
         "//nisaba/brahmic/data/script/{}:{}.tsv".format(script, file_name)
         for script in SCRIPTS
diff --git a/nisaba/utils/grammars.bzl b/nisaba/utils/grammars.bzl
index f13c7b97..d8b1ecc8 100644
--- a/nisaba/utils/grammars.bzl
+++ b/nisaba/utils/grammars.bzl
@@ -55,7 +55,6 @@ def nisaba_compile_grm_py(
 
 def nisaba_compile_multi_grm_py(
         name,
-        outs,
         deps = None,
         data = None,
         **kwds):
@@ -63,11 +62,11 @@ def nisaba_compile_multi_grm_py(
 
     Turns a Pynini file into a FAR file with the specified FAR and FST types.
 
+    Assumes that there are exactly two output files, and that they are "byte"
+    and "utf8" mode versions of the created FSTs.
+
     Args:
       name: The BUILD rule name and the file prefix for the generated output.
-      outs: A dictionary mapping designators to files, where designator
-            is the designating name used in the Pynini file to refer to the
-            corresponding file. The designated files must have extension ".far".
       deps: A list of other compile_grm rules that we'll need for this grammar.
       data: Extra data dependencies used in the Pynini file.
       **kwds: Attributes common to all BUILD rules, e.g., testonly, visibility.
@@ -75,7 +74,7 @@ def nisaba_compile_multi_grm_py(
     compile_multi_grm_py(
         name = name,
         fst_type = _FST_TYPE,
-        outs = outs,
+        outs = {"byte": name + ".far", "utf8": name + "_utf8.far"},
         data = data,
         deps = deps + [
         ],