diff --git a/utils/llvm-build/llvmbuild/main.py b/utils/llvm-build/llvmbuild/main.py
index eacefdf60bf..40d25f5cef8 100644
--- a/utils/llvm-build/llvmbuild/main.py
+++ b/utils/llvm-build/llvmbuild/main.py
@@ -412,7 +412,7 @@ subdirectories = %s
             if library_name is None:
                 library_name_as_cstr = '0'
             else:
-                library_name_as_cstr = '"lib%s.a"' % library_name
+                library_name_as_cstr = '"lib%s.so"' % library_name
             f.write('  { "%s", %s, %d, { %s } },\n' % (
                 name, library_name_as_cstr, is_installed,
                 ', '.join('"%s"' % dep