diff --git a/srcpkgs/firefox/template b/srcpkgs/firefox/template
index b9a3bfba930..0ad754c84a2 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -77,6 +77,13 @@ do_build() {
 		export CXXFLAGS+=" -fno-delete-null-pointer-checks -fno-lifetime-dse -fno-schedule-insns2"
 	fi
 
+	case "$XBPS_TARGET_MACHINE" in
+	i686)
+		export CFLAGS+=" -D_FILE_OFFSET_BITS=64"
+		export CXXFLAGS+=" -D_FILE_OFFSET_BITS=64"
+		;;
+	esac
+
 	export LDFLAGS+=" -Wl,-rpath=/usr/lib/firefox"
 
 	if [ "$SOURCE_DATE_EPOCH" ]; then