diff --git a/t/freed-bytes-commas.t b/t/freed-bytes-commas.t
index c675997..a61355a 100644
--- a/t/freed-bytes-commas.t
+++ b/t/freed-bytes-commas.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/freed-bytes.t b/t/freed-bytes.t
index b269a6b..cdb2f0f 100644
--- a/t/freed-bytes.t
+++ b/t/freed-bytes.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/link-counting.t b/t/link-counting.t
index bbd80f7..c712a5b 100644
--- a/t/link-counting.t
+++ b/t/link-counting.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/normal-linkage.t b/t/normal-linkage.t
index 3eecb92..230c3dd 100644
--- a/t/normal-linkage.t
+++ b/t/normal-linkage.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/normal-non-linkage.t b/t/normal-non-linkage.t
index 4187f4a..ca01c3e 100644
--- a/t/normal-non-linkage.t
+++ b/t/normal-non-linkage.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/sha1collision-non-linkage.t b/t/sha1collision-non-linkage.t
index 501bfc4..9ccd208 100644
--- a/t/sha1collision-non-linkage.t
+++ b/t/sha1collision-non-linkage.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/timestamp-preservation.t b/t/timestamp-preservation.t
index 60e52c6..ef46cac 100644
--- a/t/timestamp-preservation.t
+++ b/t/timestamp-preservation.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;
 
diff --git a/t/zero-size-non-linkage.t b/t/zero-size-non-linkage.t
index 55d3121..bbacec8 100644
--- a/t/zero-size-non-linkage.t
+++ b/t/zero-size-non-linkage.t
@@ -1,3 +1,4 @@
+#!perl
 use strict;
 use warnings;