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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index fc5326ff1c..29f27a51aa 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -85,7 +85,7 @@ typedef uintptr_t VALUE;
typedef uintptr_t ID;
# define SIGNED_VALUE intptr_t
# define SIZEOF_VALUE SIZEOF_UINTPTR_T
-# undef PRI_VALUE_PREFIX
+# define PRI_VALUE_PREFIX ""
#elif SIZEOF_LONG == SIZEOF_VOIDP
typedef unsigned long VALUE;
typedef unsigned long ID;