1 files changed, 1 insertions, 1 deletions
diff --git a/acprep b/acprep
index b2c39b7c..80de4c73 100755
--- a/acprep
+++ b/acprep
@@ -234,7 +234,7 @@ class PrepareBuild(CommandLineApp):
                       type='int', action='store', dest='jobs',
                       default=1, help='Allow N make jobs at once')
         op.add_option('', '--boost', metavar='SUFFIX',
-                      action="callback",
+                      action="callback", type="string",
                       callback=self.option_boost,
                       help='Set Boost library suffix (ex: "--boost=-mt")')
         op.add_option('', '--force', action="callback",