diff --git a/configure.ac b/configure.ac
index 4512dfa..ffe107f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,8 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
-AC_INIT(src/thread.cpp)
+AC_INIT
+AC_CONFIG_SRCDIR([src/thread.cpp])
 AC_CONFIG_MACRO_DIR([m4])
 m4_pattern_allow(LT_VERSION)