diff --git a/src/configure.in b/src/configure.in
index 8eaddcb..ad00d42 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -152,7 +152,7 @@
 
   if test "$enable_darwin" = "yes"; then
     MACOSX=yes
-    OS_EXTRA_SCR="os_macosx.c os_mac_conv.c";
+    OS_EXTRA_SRC="os_macosx.c os_mac_conv.c";
     OS_EXTRA_OBJ="objects/os_macosx.o objects/os_mac_conv.o"
     dnl TODO: use -arch i386 on Intel machines
     CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX -no-cpp-precomp"