diff --git a/interpreter/test/custom_section.wast b/interpreter/test/custom_section.wast
new file mode 100644
index 0000000000..14441ff0ae
--- /dev/null
+++ b/interpreter/test/custom_section.wast
@@ -0,0 +1,5 @@
+(module "\00asm" "\0d\00\00\00" "\00\24\10" "a custom section" "this is the payload")
+(module "\00asm" "\0d\00\00\00" "\00\24\10" "a custom section" "this is the payload" "\00\24\10" "a custom section" "this is the payload")
+
+(assert_malformed (module "\00asm" "\0d\00\00\00" "\00\26\10" "a custom section" "this is the payload") "unexpected end")
+(assert_malformed (module "\00asm" "\0d\00\00\00" "\00\24\11" "a custom section" "this is the payload" "\00\25\10" "a custom section" "this is the payload") "unexpected end")