diff --git a/script/cibuild b/script/cibuild
index 2c2382a8e..b02691b70 100755
--- a/script/cibuild
+++ b/script/cibuild
@@ -22,4 +22,8 @@ fi
 make -C vendor/nanopb/generator/proto
 make -C firmware/protob
 
-make -C firmware sign
+make -C firmware
+
+if [ "$EMULATOR" != 1 ]; then
+    make -C firmware sign
+fi