diff --git a/dovecot.spec b/dovecot.spec
index 5077164..6704885 100644
--- a/dovecot.spec
+++ b/dovecot.spec
@@ -50,6 +50,7 @@ BuildRequires: quota-devel
 BuildRequires: xz-devel
 BuildRequires: lz4-devel
 BuildRequires: libsodium-devel
+BuildRequires: libicu-devel
 BuildRequires: libexttextcat-devel
 BuildRequires: libstemmer-devel
 
@@ -151,6 +152,7 @@ autoreconf -I . -fiv #required for aarch64 support
     --with-sqlite                \
     --with-zlib                  \
     --with-libcap                \
+    --with-icu                   \
     --with-lucene                \
     --with-ssl=openssl           \
     --with-ssldir=%{ssldir}      \