diff --git a/tests/data/test1972 b/tests/data/test1972
index 1fb52b4e50..5a07d544d4 100644
--- a/tests/data/test1972
+++ b/tests/data/test1972
@@ -39,6 +39,9 @@ Debug
 crypto
 aws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 
 <name>
 HTTP AWS_SIGV4 for AWS S3: MIMEPOST
diff --git a/tests/data/test2300 b/tests/data/test2300
index e8a145929f..6cb941dac3 100644
--- a/tests/data/test2300
+++ b/tests/data/test2300
@@ -25,11 +25,14 @@ upgrade
 #
 # Client-side
 <client>
-# for the forced CURL_ENTROPY
+# require Debug for the forced CURL_ENTROPY
 <features>
 Debug
 ws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <server>
 http
 </server>
diff --git a/tests/data/test2301 b/tests/data/test2301
index 61079d28c0..e3cab99f15 100644
--- a/tests/data/test2301
+++ b/tests/data/test2301
@@ -32,6 +32,9 @@ upgrade
 Debug
 ws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <server>
 http
 </server>
diff --git a/tests/data/test2302 b/tests/data/test2302
index 52887e8b7d..b1d11fcf6e 100644
--- a/tests/data/test2302
+++ b/tests/data/test2302
@@ -32,6 +32,9 @@ upgrade
 Debug
 ws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <server>
 http
 </server>
diff --git a/tests/data/test2303 b/tests/data/test2303
index ab1edb2f57..d90d23dc9e 100644
--- a/tests/data/test2303
+++ b/tests/data/test2303
@@ -25,6 +25,9 @@ hello
 Debug
 ws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <server>
 http
 </server>
diff --git a/tests/data/test2304 b/tests/data/test2304
index a141f52ccc..21fac7a0f0 100644
--- a/tests/data/test2304
+++ b/tests/data/test2304
@@ -31,6 +31,9 @@ upgrade
 Debug
 ws
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <server>
 http
 </server>
diff --git a/tests/data/test823 b/tests/data/test823
index 3a7686affd..91d75fed4a 100644
--- a/tests/data/test823
+++ b/tests/data/test823
@@ -40,6 +40,9 @@ Debug
 crypto
 digest
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <name>
 IMAP DIGEST-MD5 authentication
 </name>
diff --git a/tests/data/test869 b/tests/data/test869
index be374dc2c0..b6f91a266a 100644
--- a/tests/data/test869
+++ b/tests/data/test869
@@ -42,6 +42,9 @@ Debug
 crypto
 digest
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <name>
 POP3 DIGEST-MD5 authentication
 </name>
diff --git a/tests/data/test907 b/tests/data/test907
index 30d05370ca..9fddbc0de8 100644
--- a/tests/data/test907
+++ b/tests/data/test907
@@ -32,6 +32,9 @@ Debug
 crypto
 digest
 </features>
+<setenv>
+CURL_ENTROPY=12345678
+</setenv>
 <name>
 SMTP DIGEST-MD5 authentication
 </name>
diff --git a/tests/runner.pm b/tests/runner.pm
index d4a4dc3852..2122c167ca 100644
--- a/tests/runner.pm
+++ b/tests/runner.pm
@@ -163,7 +163,7 @@ sub runner_init {
 
     # enable memory debugging if curl is compiled with it
     $ENV{'CURL_MEMDEBUG'} = "$logdir/$MEMDUMP";
-    $ENV{'CURL_ENTROPY'}="12345678";
+    delete $ENV{'CURL_ENTROPY'} if($ENV{'CURL_ENTROPY'});
     $ENV{'CURL_FORCETIME'}=1; # for debug NTLM magic
     $ENV{'CURL_GLOBAL_INIT'}=1; # debug curl_global_init/cleanup use
     $ENV{'HOME'}=$pwd;