diff --git a/tests/lib-tests.scm b/tests/lib-tests.scm
index 505c1d9f..c7971048 100644
--- a/tests/lib-tests.scm
+++ b/tests/lib-tests.scm
@@ -9,6 +9,7 @@
 (load "tests/srfi-1-tests.scm")
 (load "tests/srfi-2-tests.scm")
 (load "tests/srfi-16-tests.scm")
+(load "tests/srfi-27-tests.scm")
 (load "tests/srfi-38-tests.scm")
 (load "tests/flonum-tests.scm")
 (load "tests/numeric-tests.scm")
@@ -20,6 +21,11 @@
 (load "tests/uri-tests.scm")
 (load "tests/mime-tests.scm")
 (load "tests/regexp-tests.scm")
+(load "tests/prime-tests.scm")
+(load "tests/md5-tests.scm")
+(load "tests/sha-tests.scm")
+;; (load "tests/rsa-tests.scm")
+(load "tests/tar-tests.scm")
 (cond-expand (full-unicode (load "tests/unicode-tests.scm")) (else #f))
 
 (cond-expand
diff --git a/tests/md5-tests.scm b/tests/md5-tests.scm
index 497cd1f8..14ef9ab3 100644
--- a/tests/md5-tests.scm
+++ b/tests/md5-tests.scm
@@ -1,5 +1,5 @@
 
-(import (scheme base) (chibi crypto md5) (chibi test))
+(import (chibi crypto md5) (chibi test))
 
 (test-begin "md5")
 
diff --git a/tests/sha-tests.scm b/tests/sha-tests.scm
index 1c3682a9..573b31b3 100644
--- a/tests/sha-tests.scm
+++ b/tests/sha-tests.scm
@@ -1,5 +1,5 @@
 
-(import (scheme base) (chibi crypto sha2) (chibi test))
+(import (chibi crypto sha2) (chibi test))
 
 (test-begin "sha2")
 
diff --git a/tests/srfi-27-tests.scm b/tests/srfi-27-tests.scm
index 72556d66..ebdb4d65 100644
--- a/tests/srfi-27-tests.scm
+++ b/tests/srfi-27-tests.scm
@@ -1,5 +1,5 @@
 
-(import (scheme base)
+(import (chibi)
         (srfi 27)
         (chibi test))
 
diff --git a/tests/tar-tests.scm b/tests/tar-tests.scm
index c1675d3c..d57c048f 100644
--- a/tests/tar-tests.scm
+++ b/tests/tar-tests.scm
@@ -1,5 +1,16 @@
 
-(import (scheme base) (scheme write) (chibi tar) (chibi test))
+(import (chibi)
+        (only (scheme base)
+              bytevector-append
+              make-bytevector
+              string->utf8
+              bytevector
+              open-input-bytevector
+              open-output-bytevector
+              get-output-bytevector
+              )
+        (chibi tar)
+        (chibi test))
 
 (test-begin "tar")