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-rw-r--r--py/modmath.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/modmath.c b/py/modmath.c
index 7c51eab03..7b67751bc 100644
--- a/py/modmath.c
+++ b/py/modmath.c
@@ -70,7 +70,7 @@ STATIC NORETURN void math_error(void) {
} \
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_math_## py_name ## _obj, mp_math_ ## py_name);
-#if MP_NEED_LOG2
+#ifdef MP_NEED_LOG2
// 1.442695040888963407354163704 is 1/_M_LN2
#define log2(x) (log(x) * 1.442695040888963407354163704)
#endif