diff --git a/scons/custom.py b/scons/custom.py
index 544b15de1a4..955247ccf20 100644
--- a/scons/custom.py
+++ b/scons/custom.py
@@ -281,7 +281,7 @@ def parse_source_list(env, filename, names=None):
                     # cause duplicate actions.
                     f = f[len(cur_srcdir + '/'):]
                 # do not include any headers
-                if f.endswith(tuple(['.h','.hpp'])):
+                if f.endswith(tuple(['.h','.hpp','.inl'])):
                     continue
                 srcs.append(f)