diff --git a/php-maxminddb.spec b/php-maxminddb.spec
index ddd2e71..be7965a 100644
--- a/php-maxminddb.spec
+++ b/php-maxminddb.spec
@@ -221,7 +221,7 @@ done
 php --define extension=%{buildroot}%{php_extdir}/%{pecl_name}.so \
   %{_bindir}/phpunit \
     --bootstrap %{buildroot}%{_datadir}/php/MaxMind/Db/Reader/autoload.php \
-%if %{__isa_bits} < 64
+%if 0%{?__isa_bits} < 64
     --filter '^((?!(testDecoder)).)*$' \
 %endif
     --verbose || ret=1