diff --git a/template/ruby-runner.h.in b/template/ruby-runner.h.in
index fdfe88dcb9..83fb0b4e87 100644
--- a/template/ruby-runner.h.in
+++ b/template/ruby-runner.h.in
@@ -6,4 +6,3 @@
 #define PATH_SEP   '@PATH_SEPARATOR@'
 #define EXTOUT     "@EXTOUT@"
 #define ARCH       "@arch@"
-#define SOEXT      "@SOEXT@"