diff --git a/OpenEXR_Viewers.spec b/OpenEXR_Viewers.spec
index 05180b2..5c537a6 100644
--- a/OpenEXR_Viewers.spec
+++ b/OpenEXR_Viewers.spec
@@ -79,7 +79,7 @@ This package contains documentation files for %{name}.
 #cp -n %{SOURCE1} exrdisplay/namespaceAlias.h
 #patch2 -p1 -b .header
 
-%if %{_lib} == lib64
+%if "%{_lib}" == "lib64"
 sed -i -e 's|ACTUAL_PREFIX/lib/CTL|ACTUAL_PREFIX/lib64/CTL|' configure.ac
 %endif
 #Needed for patch1 and to update CTL compiler test