diff --git a/math/gsl/files/patch-configure b/math/gsl/files/patch-configure
index 3193c08d671a..c39b7fdefbc7 100644
--- a/math/gsl/files/patch-configure
+++ b/math/gsl/files/patch-configure
@@ -15,7 +15,7 @@
 +    sparc64-*-*bsd*)
 +        ac_cv_c_ieee_interface=unknown
 +	;;
-+    amd64-*-*bsd*)
++    alpha-*-*bsd*)
 +        ac_cv_c_ieee_interface=unknown
 +	;;
 +    ia64-*-*bsd*)