diff --git a/test/ken/simparray.go b/test/ken/simparray.go
index e1b41058f1..1cbde1bd47 100644
--- a/test/ken/simparray.go
+++ b/test/ken/simparray.go
@@ -17,33 +17,33 @@ main()
 		a[i] = float(i);
 	}
 
-	s := float(0);
+	s1 := float(0);
 	for i:=5; i<10; i=i+1 {
-		s = s + a[i];
+		s1 = s1 + a[i];
 	}
 
-	if s != 35 { panic s; }
+	if s1 != 35 { panic s1; }
 
 	for i:=short(5); i<10; i=i+1 {
 		b[i] = float(i);
 	}
 
-	s := float(0);
+	s2 := float(0);
 	for i:=5; i<10; i=i+1 {
-		s = s + b[i];
+		s2 = s2 + b[i];
 	}
 
-	if s != 35 { panic s; }
+	if s2 != 35 { panic s2; }
 
 	b := new([100]int);
 	for i:=0; i<100; i=i+1 {
 		b[i] = i;
 	}
 
-	s := 0;
+	s3 := 0;
 	for i:=0; i<100; i=i+1 {
-		s = s+b[i];
+		s3 = s3+b[i];
 	}
 
-	if s != 4950 { panic s; }
+	if s3 != 4950 { panic s3; }
 }
diff --git a/test/ken/simpconv.go b/test/ken/simpconv.go
index df8242ba35..895024e5bf 100644
--- a/test/ken/simpconv.go
+++ b/test/ken/simpconv.go
@@ -9,15 +9,15 @@ package main
 func
 main()
 {
-	s := vlong(0);
+	s1 := vlong(0);
 	for i:=short(0); i<10; i=i+1 {
-		s = s + vlong(i);
+		s1 = s1 + vlong(i);
 	}
-	if s != 45 { panic s; }
+	if s1 != 45 { panic s1; }
 
-	s := float(0);
+	s2 := float(0);
 	for i:=0; i<10; i=i+1 {
-		s = s + float(i);
+		s2 = s2 + float(i);
 	}
-	if s != 45 { panic s; }
+	if s2 != 45 { panic s2; }
 }
diff --git a/test/ken/string.go b/test/ken/string.go
index 85cb83a645..51da6a2301 100644
--- a/test/ken/string.go
+++ b/test/ken/string.go
@@ -82,21 +82,21 @@ main()
 	}
 
 	/* create string with byte array */
-	var z [3]byte;
-	z[0] = 'a';
-	z[1] = 'b';
-	z[2] = 'c';
-	c = string(z);
+	var z1 [3]byte;
+	z1[0] = 'a';
+	z1[1] = 'b';
+	z1[2] = 'c';
+	c = string(z1);
 	if c != "abc" {
 		panic "create array ", c;
 	}
 
 	/* create string with byte array pointer */
-	z := new([3]byte);
-	z[0] = 'a';
-	z[1] = 'b';
-	z[2] = 'c';
-	c = string(z);
+	z2 := new([3]byte);
+	z2[0] = 'a';
+	z2[1] = 'b';
+	z2[2] = 'c';
+	c = string(z2);
 	if c != "abc" {
 		panic "create array pointer ", c;
 	}