diff --git a/test/Jamfile b/test/Jamfile
index a29f45d4..ecb7fa7b 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -21,6 +21,7 @@ local test-files = $(test-dir)tests.txt
            : 
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
            :
                     regress ]
 
@@ -34,6 +35,7 @@ local test-files = $(test-dir)tests.txt
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>TEST_UNICODE=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
             :
                     wregress ]
 
@@ -44,6 +46,7 @@ local test-files = $(test-dir)tests.txt
             : 
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
             :
                     posix_api_check_c ]
 
@@ -54,6 +57,7 @@ local test-files = $(test-dir)tests.txt
             : 
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
             :
                     wide_posix_api_check_c ]
 
@@ -64,6 +68,7 @@ local test-files = $(test-dir)tests.txt
             :
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
             ]
 
             [ run c_compiler_checks/wide_posix_api_check.cpp
@@ -73,6 +78,8 @@ local test-files = $(test-dir)tests.txt
             : 
                     <define>BOOST_REGEX_NO_LIB=1
                     <define>BOOST_REGEX_STATIC_LINK=1
+                    <threading>multi
             ]
 ;
 
+