1 files changed, 1 insertions, 1 deletions
diff --git a/compile.c b/compile.c
index 08895134bd..17f870e3e5 100644
--- a/compile.c
+++ b/compile.c
@@ -10713,7 +10713,7 @@ typedef unsigned int ibf_offset_t;
 #define IBF_OFFSET(ptr) ((ibf_offset_t)(VALUE)(ptr))
 
 #define IBF_MAJOR_VERSION ISEQ_MAJOR_VERSION
-#if RUBY_DEVEL
+#ifdef RUBY_DEVEL
 #define IBF_DEVEL_VERSION 4
 #define IBF_MINOR_VERSION (ISEQ_MINOR_VERSION * 10000 + IBF_DEVEL_VERSION)
 #else