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-rw-r--r--src/algebra/strap/ISTRING.lsp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/strap/ISTRING.lsp b/src/algebra/strap/ISTRING.lsp
index e8a3de19..e1760a16 100644
--- a/src/algebra/strap/ISTRING.lsp
+++ b/src/algebra/strap/ISTRING.lsp
@@ -134,7 +134,7 @@
(DEFUN |ISTRING;empty;$;2| ($) (MAKE-FULL-CVEC 0))
-(DEFUN |ISTRING;empty?;$B;3| (|s| $) (EQL (QCSIZE |s|) 0))
+(DEFUN |ISTRING;empty?;$B;3| (|s| $) (ZEROP (QCSIZE |s|)))
(DEFUN |ISTRING;#;$Nni;4| (|s| $) (DECLARE (IGNORE $)) (QCSIZE |s|))