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-rw-r--r--src/interp/i-spec2.boot2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/interp/i-spec2.boot b/src/interp/i-spec2.boot
index 5b3742ee..a4abcc75 100644
--- a/src/interp/i-spec2.boot
+++ b/src/interp/i-spec2.boot
@@ -731,7 +731,7 @@ isType t ==
op:=opOf t
VECP op =>
isMap(op:= getUnname op) => NIL
- op = 'Mapping =>
+ op = 'Mapping and CONSP t =>
argTypes := [isType type for type in rest t]
"or"/[null type for type in argTypes] => nil
['Mapping, :argTypes]