diff --git a/src/syntax.c b/src/syntax.c
index c458e39..fc94535 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -89,7 +89,7 @@ struct Object *syntax_if(
     struct Object *const environment
 ) {
     assert(Object_is_pair(args));
-    struct Object *const cond = args->pair.car;
+    struct Object *const cond_expr = args->pair.car;
     struct Object *const then_else_list = args->pair.cdr;
     assert(then_else_list);
     assert(Object_is_pair(then_else_list));
@@ -100,7 +100,7 @@ struct Object *syntax_if(
     struct Object *const else_branch = else_list->pair.car;
     assert(OBJECT_IS_NULL(else_list->pair.cdr));
 
-    if (Object_is_false(cond)) {
+    if (Object_is_false(eval(cond_expr, environment))) {
         return eval(else_branch, environment);
     } else {
         return eval(then_branch, environment);