diff --git a/Mk/plugins.mk b/Mk/plugins.mk
index ba49c9d1a..14fa3fe73 100644
--- a/Mk/plugins.mk
+++ b/Mk/plugins.mk
@@ -388,10 +388,6 @@ plist-fix:
 sweep: check
 	find ${.CURDIR}/src -type f -name "*.map" -print0 | \
 	    xargs -0 -n1 rm
-	if grep -nr sourceMappingURL= ${.CURDIR}/src; then \
-		echo "Mentions of sourceMappingURL must be removed"; \
-		exit 1; \
-	fi
 	find ${.CURDIR}/src ! -name "*.min.*" ! -name "*.svg" \
 	    ! -name "*.ser" -type f -print0 | \
 	    xargs -0 -n1 ${SCRIPTSDIR}/cleanfile