diff --git a/test/tools/llvm-strings/Inputs/variable-length b/test/tools/llvm-strings/Inputs/variable-length
new file mode 100644
index 00000000000..649f68c12db
--- /dev/null
+++ b/test/tools/llvm-strings/Inputs/variable-length
@@ -0,0 +1,4 @@
+a
+ab
+abc
+abcd
diff --git a/test/tools/llvm-strings/length.test b/test/tools/llvm-strings/length.test
index f64829dc885..20d586df820 100644
--- a/test/tools/llvm-strings/length.test
+++ b/test/tools/llvm-strings/length.test
@@ -1,7 +1,7 @@
-RUN: sed -n 's/^STDIN: //p' %s | llvm-strings | FileCheck --check-prefix CHECK-DEFAULT %s
-RUN: sed -n 's/^STDIN: //p' %s | not llvm-strings -n 0 2>&1 | FileCheck --check-prefix CHECK-0 %s
-RUN: sed -n 's/^STDIN: //p' %s | llvm-strings -n 1 | FileCheck --check-prefix CHECK-1 %s
-RUN: sed -n 's/^STDIN: //p' %s | llvm-strings -n 2 | FileCheck --check-prefix CHECK-2 %s
+RUN: not llvm-strings -n 0 2>&1 %S/Inputs/variable-length | FileCheck --check-prefix CHECK-0 %s
+RUN: llvm-strings -n 1 %S/Inputs/variable-length | FileCheck --check-prefix CHECK-1 %s
+RUN: llvm-strings -n 2 %S/Inputs/variable-length | FileCheck --check-prefix CHECK-2 %s
+RUN: llvm-strings %S/Inputs/variable-length | FileCheck --check-prefix CHECK-DEFAULT %s
 
 STDIN: a
 STDIN: ab