diff --git a/test/integration/stream_fusion.jl b/test/integration/stream_fusion.jl
index 5b24d3e7..b119c069 100644
--- a/test/integration/stream_fusion.jl
+++ b/test/integration/stream_fusion.jl
@@ -49,7 +49,7 @@ fold_theory = @theory x y z begin
   x::Number * y::Number => x * y
   x::Number + y::Number => x + y
   x::Number / y::Number => x / y
-  x::Number - y::Number => x / y
+  x::Number - y::Number => x - y
   # etc...
 end