diff --git a/libs/fst/wscript b/libs/fst/wscript
index 725cd9ec15..d0d0ee72a0 100644
--- a/libs/fst/wscript
+++ b/libs/fst/wscript
@@ -38,7 +38,7 @@ def build(bld):
             obj.linkflags = ['-mwindows']
 
         if re.search ("bsd", sys.platform) != None:
-            obj.defines.append('_POSIX_C_SOURCE=200809')
+            obj.defines.append('_POSIX_C_SOURCE=200809L')
             obj.defines.append('_XOPEN_SOURCE=700')
 
         obj.install_path = os.path.join(bld.env['LIBDIR'])
diff --git a/libs/tk/ydk-pixbuf/wscript b/libs/tk/ydk-pixbuf/wscript
index 8995b54681..b0a832f8b1 100644
--- a/libs/tk/ydk-pixbuf/wscript
+++ b/libs/tk/ydk-pixbuf/wscript
@@ -66,4 +66,4 @@ def build(bld):
         obj.ldflags     = ' -lintl'
 
     if re.search ("bsd", sys.platform) != None:
-        obj.defines.append('_POSIX_C_SOURCE=200809')
+        obj.defines.append('_POSIX_C_SOURCE=200809L')