diff --git a/Modules/FindJava.cmake b/Modules/FindJava.cmake
index 4265a97830..3d32560306 100644
--- a/Modules/FindJava.cmake
+++ b/Modules/FindJava.cmake
@@ -143,6 +143,9 @@ if(Java_JAVA_EXECUTABLE)
       if(var MATCHES "java version \"([0-9]+\\.[0-9]+\\.[0-9_.]+.*)\"")
         # This is most likely Sun / OpenJDK, or maybe GCJ-java compat layer
         set(Java_VERSION_STRING "${CMAKE_MATCH_1}")
+      elseif(var MATCHES "openjdk version \"([0-9]+)-[a-z]+\"")
+        # OpenJDK 9 early access builds or locally built
+        set(Java_VERSION_STRING "1.${CMAKE_MATCH_1}.0")
       elseif(var MATCHES "java full version \"kaffe-([0-9]+\\.[0-9]+\\.[0-9_]+)\"")
         # Kaffe style
         set(Java_VERSION_STRING "${CMAKE_MATCH_1}")