diff --git a/test/compliance/cases/stdlib/number_format_type_error.phpt b/test/compliance/cases/stdlib/number_format_type_error.phpt
new file mode 100644
index 00000000000..45d40341107
--- /dev/null
+++ b/test/compliance/cases/stdlib/number_format_type_error.phpt
@@ -0,0 +1,11 @@
+--TEST--
+stdlib number_format() — array $num operand TypeError (#4163, ext/standard/number_format.c)
+--FILE--
+<?php
+try {
+    number_format(['x']);
+} catch (TypeError $e) {
+    echo $e->getMessage(), "\n";
+}
+--EXPECT--
+number_format(): Argument #1 ($num) must be of type float, array given
diff --git a/test/compliance/cases/stdlib/number_format_type_error_jit.phpt b/test/compliance/cases/stdlib/number_format_type_error_jit.phpt
new file mode 100644
index 00000000000..3434bb3c074
--- /dev/null
+++ b/test/compliance/cases/stdlib/number_format_type_error_jit.phpt
@@ -0,0 +1,11 @@
+--TEST--
+stdlib number_format() JIT — array $num operand TypeError (#4163, ext/standard/number_format.c)
+--FILE--
+<?php
+try {
+    number_format(['x']);
+} catch (TypeError $e) {
+    echo $e->getMessage(), "\n";
+}
+--EXPECT--
+number_format(): Argument #1 ($num) must be of type float, array given