diff --git a/firefox-esr.changes b/firefox-esr.changes
index 988d6b3..884b33a 100644
--- a/firefox-esr.changes
+++ b/firefox-esr.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sat Nov 16 07:47:06 UTC 2019 - Manfred Hollstein <manfred.h@gmx.net>
+
+- Ensure %{ff_esr_name} get tested as a string; also, don't compare
+  against an empty string.
+
 -------------------------------------------------------------------
 Thu Nov 14 09:51:00 UTC 2019 - Antonio Larrosa <alarrosa@suse.com>
 
diff --git a/firefox-esr.spec b/firefox-esr.spec
index a6885e2..da5b548 100644
--- a/firefox-esr.spec
+++ b/firefox-esr.spec
@@ -17,7 +17,7 @@
 #
 
 # either MozillaFirefox or firefox-esr
-%if "%{ff_esr_name}" != ""
+%if "0%{?ff_esr_name}" != "0"
 %define pkgname %{ff_esr_name}
 %else
 %if 0%{?suse_version} > 1549