diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index a3a8608d9..9a35dd594 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -1,4 +1,5 @@
 %option reentrant bison-bridge bison-locations
+%option align
 %option noyywrap
 %option never-interactive
 %option stack