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-rw-r--r--ext/fiddle/closure.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
index 1aab631..5439140 100644
--- a/ext/fiddle/closure.c
+++ b/ext/fiddle/closure.c
@@ -13,7 +13,7 @@ typedef struct {
#if defined(USE_FFI_CLOSURE_ALLOC)
#elif defined(__OpenBSD__)
# define USE_FFI_CLOSURE_ALLOC 0
-#elif RUBY_LIBFFI_MODVERSION < 3000005 && \
+#elif defined(RUBY_LIBFFI_MODVERSION) && RUBY_LIBFFI_MODVERSION < 3000005 && \
(defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_AMD64))
# define USE_FFI_CLOSURE_ALLOC 0
#else