diff --git a/testing/btest/Baseline/plugins.reader/out b/testing/btest/Baseline/plugins.reader/out
index 9dd3101a8d..8d8c46dd8e 100644
--- a/testing/btest/Baseline/plugins.reader/out
+++ b/testing/btest/Baseline/plugins.reader/out
@@ -1,10 +1,10 @@
 Input::EVENT_NEW
-^)kHV32-J_
+1K@_(-PQ7S
 Input::EVENT_NEW
-(s[Q8J4Pu4
+PS17T[f6s\
 Input::EVENT_NEW
-+3iDbOB}kq
+39P|JR@F_C
 Input::EVENT_NEW
-tz9dFehHz)
+#iHW2{G_22
 Input::EVENT_NEW
-d&@3g)NljG
+#Ykb&UeAwg
diff --git a/testing/btest/plugins/reader-plugin/src/Foo.cc b/testing/btest/plugins/reader-plugin/src/Foo.cc
index 9d79361068..acfd094aa9 100644
--- a/testing/btest/plugins/reader-plugin/src/Foo.cc
+++ b/testing/btest/plugins/reader-plugin/src/Foo.cc
@@ -45,7 +45,10 @@ string Foo::RandomString(const int len)
 	"abcdefghijklmnopqrstuvwxyz";
 
 	for (int i = 0; i < len; ++i)
-		s[i] = values[random() / (RAND_MAX / sizeof(values))];
+		// bro_random is not thread-safe; as we are only using one simultaneous thread
+		// here, this should not matter in this case. If this test ever starts showing
+		// random errors, this might be the culprit.
+		s[i] = values[bro_random() / (RAND_MAX / sizeof(values))];
 
 	return s;
 	}