diff --git a/rline.c b/rline.c
index 53aa3e1..46daa3a 100644
--- a/rline.c
+++ b/rline.c
@@ -1036,7 +1036,7 @@ struct syntax_definition {
 	{"python",syn_py_calculate, 1},
 	{"esh",syn_esh_calculate, 0},
 #endif
-	{NULL, NULL, NULL},
+	{NULL, NULL, 0},
 };
 
 static struct syntax_definition * syntax;
diff --git a/src/math.c b/src/math.c
index 611864e..f5dc7e0 100644
--- a/src/math.c
+++ b/src/math.c
@@ -199,7 +199,7 @@ KrkValue krk_module_onload_math(void) {
 	bind(pow);
 	bind(atan2);
 	bind(frexp);
-#ifdef _math_isfinite
+#ifdef isfinite
 	bind(isfinite);
 	bind(isinf);
 	bind(isnan);