diff --git a/boost/libs/context/build/Jamfile.v2 b/boost/libs/context/build/Jamfile.v2

index faaf892c79..c07847ab42 100644

--- a/boost/libs/context/build/Jamfile.v2

+++ b/boost/libs/context/build/Jamfile.v2

@@ -79,7 +79,8 @@ local rule default_abi ( )

     local tmp = sysv ;

     if [ os.name ] = "NT" { tmp = ms ; }

     else if [ os.name ] = "CYGWIN" { tmp = ms ; }

-    else if [ os.platform ] in ARM ARM64 { tmp = aapcs ; }

+    else if [ os.platform ] = "ARM" { tmp = aapcs ; }

+    else if [ os.platform ] = "ARM64" { tmp = aapcs ; }

     else if [ os.platform ] = "MIPS32" { tmp = o32 ; }

     else if [ os.platform ] = "MIPS64" { tmp = n64 ; }

     return $(tmp) ;