diff --git a/configure.ac b/configure.ac
index be8261a..60fe8ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1681,6 +1681,7 @@ else
 		-Wall
 		-Waggregate-return
 		-Wbad-function-cast
+		-Wcast-align
 		-Wdeclaration-after-statement
 		-Wendif-labels
 		-Wfloat-equal