diff --git a/xmlstreambuffer.spec b/xmlstreambuffer.spec
index e873168..ccdad0a 100644
--- a/xmlstreambuffer.spec
+++ b/xmlstreambuffer.spec
@@ -28,6 +28,7 @@ Patch0:         jakarta.patch
 BuildRequires:  fdupes
 BuildRequires:  java-devel >= 1.8
 BuildRequires:  maven-local
+BuildRequires:  stax-ex
 BuildRequires:  mvn(net.java:jvnet-parent:pom:)
 BuildRequires:  mvn(org.apache.felix:maven-bundle-plugin)
 BuildRequires:  mvn(org.jvnet.staxex:stax-ex)