diff --git a/php.spec b/php.spec
index eafc97e..3aefc8b 100644
--- a/php.spec
+++ b/php.spec
@@ -24,7 +24,7 @@
 %global with_fpm 0
 %endif
 
-%if %{?__isa:1}
+%if 0%{?__isa:1}
 %global isasuffix -%{__isa}
 %else
 %global isasuffix %nil