diff --git a/openregex.spec b/openregex.spec
index 6c8398f..46fccc0 100644
--- a/openregex.spec
+++ b/openregex.spec
@@ -24,11 +24,17 @@ License:        LGPL-3.0-only
 URL:            https://github.com/knowitall/%{name}
 Source0:        https://github.com/knowitall/%{name}/archive/v%{version}.tar.gz
 BuildRequires:  fdupes
-BuildRequires:  java-devel >= 1.8
+BuildRequires:  java-devel >= 9
 BuildRequires:  maven-local
 BuildRequires:  mvn(com.google.code.findbugs:jsr305)
 BuildRequires:  mvn(com.google.guava:guava)
 BuildRequires:  mvn(org.sonatype.oss:oss-parent:pom:)
+BuildConflicts: java < 9
+BuildConflicts: java-devel < 9
+BuildConflicts: java-headless < 9
+BuildConflicts: java >= 12
+BuildConflicts: java-devel >= 12
+BuildConflicts: java-headless >= 12
 BuildArch:      noarch
 
 %description