diff --git a/configure.in b/configure.in
index 763535e21cb..915bb36374b 100644
--- a/configure.in
+++ b/configure.in
@@ -3832,12 +3832,6 @@ dnl are defined in build/autoconf/altoptions.m4.
 
 dnl If the compiler supports these attributes, define them as
 dnl convenience macros.
-if test "$ac_cv_attribute_always_inline" = yes ; then
-  AC_DEFINE(NS_ALWAYS_INLINE, [__attribute__((always_inline))])
-else
-  AC_DEFINE(NS_ALWAYS_INLINE,)
-fi
-
 if test "$ac_cv_attribute_malloc" = yes ; then
   AC_DEFINE(NS_ATTR_MALLOC, [__attribute__((malloc))])
 else
diff --git a/js/src/configure.in b/js/src/configure.in
index e25f5695d6d..27068db11df 100644
--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -3136,12 +3136,6 @@ dnl are defined in build/autoconf/altoptions.m4.
 
 dnl If the compiler supports these attributes, define them as
 dnl convenience macros.
-if test "$ac_cv_attribute_always_inline" = yes ; then
-  AC_DEFINE(NS_ALWAYS_INLINE, [__attribute__((always_inline))])
-else
-  AC_DEFINE(NS_ALWAYS_INLINE,)
-fi
-
 if test "$ac_cv_attribute_malloc" = yes ; then
   AC_DEFINE(NS_ATTR_MALLOC, [__attribute__((malloc))])
 else