diff --git a/src/context.c b/src/context.c
index 3bdbb04..f3e30ea 100644
--- a/src/context.c
+++ b/src/context.c
@@ -1140,7 +1140,7 @@ apfl_tostring(apfl_ctx ctx, apfl_stackidx index)
 bool
 apfl_is_truthy(apfl_ctx ctx, apfl_stackidx index)
 {
-    struct apfl_value value = apfl_stack_must_get(ctx, index);
+    struct apfl_value value = apfl_stack_must_pop(ctx, index);
     switch (value.type) {
     case VALUE_NIL:
         return false;