diff --git a/meson.build b/meson.build
index 22212358f..d644eb01d 100644
--- a/meson.build
+++ b/meson.build
@@ -35,7 +35,7 @@ if ctpp2_prefix_install == ''
   endif
   ctpp2_dep = declare_dependency(link_args:link_args)
 else
-  if find_library_in_compiler
+  if not find_library_in_compiler
     error('For custom ctpp2_prefix_install you need a meson version >=0.31.0')
   endif
   ctpp2_include_path = ctpp2_prefix_install + '/include'