diff --git a/test-suite/tests/numbers.test b/test-suite/tests/numbers.test
index 09c607b92..66830f93e 100644
--- a/test-suite/tests/numbers.test
+++ b/test-suite/tests/numbers.test
@@ -1796,6 +1796,33 @@
 ;;; inexact->exact
 ;;;
 
+;;;
+;;; integer-length
+;;;
+
+(with-test-prefix "integer-length"
+  
+  (with-test-prefix "-2^i, ...11100..00"
+    (do ((n -1 (ash n 1))
+	 (i 0  (1+ i)))
+	((> i 256))
+      (pass-if (list n "expect" i)
+	(= i (integer-length n)))))
+  
+  (with-test-prefix "-2^i+1 ...11100..01"
+    (do ((n -3 (logxor 3 (ash n 1)))
+	 (i 2  (1+ i)))
+	((> i 256))
+      (pass-if n
+	(= i (integer-length n)))))
+  
+  (with-test-prefix "-2^i-1 ...111011..11"
+    (do ((n -2 (1+ (ash n 1)))
+	 (i 1  (1+ i)))
+	((> i 256))
+      (pass-if n
+	(= i (integer-length n))))))
+
 ;;;
 ;;; logcount
 ;;;