diff --git a/cyrus-imapd.spec b/cyrus-imapd.spec
index 80933b5..ff14026 100644
--- a/cyrus-imapd.spec
+++ b/cyrus-imapd.spec
@@ -85,10 +85,10 @@ BuildRequires: perl-devel perl-generators perl(ExtUtils::MakeMaker)
 BuildRequires: perl(Pod::Html)
 
 BuildRequires: CUnit-devel clamav-devel cyrus-sasl-devel glib2-devel
-BuildRequires: jansson-devel krb5-devel libical-devel libnghttp2-devel
-BuildRequires: libxml2-devel mariadb-devel net-snmp-devel openldap-devel
-BuildRequires: openssl-devel postgresql-devel shapelib-devel sqlite-devel
-BuildRequires: xapian-core-devel
+BuildRequires: jansson-devel krb5-devel libical-devel libicu-devel
+BuildRequires: libnghttp2-devel libxml2-devel mariadb-devel net-snmp-devel
+BuildRequires: openldap-devel openssl-devel postgresql-devel shapelib-devel
+BuildRequires: sqlite-devel xapian-core-devel
 
 # Miscellaneous modules needed for 'make check' to function:
 BuildRequires: cyrus-sasl-plain cyrus-sasl-md5