diff --git a/include/iso646.h b/include/iso646.h
new file mode 100644
index 0000000000000000000000000000000000000000..d94c240909317df463987cd3680972480d174526
--- /dev/null
+++ b/include/iso646.h
@@ -0,0 +1,22 @@
+// Copied from musl
+
+#ifndef _ISO646_H
+#define _ISO646_H
+
+#ifndef __cplusplus
+
+#define and &&
+#define and_eq &=
+#define bitand &
+#define bitor |
+#define compl ~
+#define not !
+#define not_eq !=
+#define or ||
+#define or_eq |=
+#define xor ^
+#define xor_eq ^=
+
+#endif
+
+#endif
diff --git a/tests/Makefile b/tests/Makefile
index dcbcdf76142b871ff08d8d542d30ab3d9db5ec43..84ba97826136bec1c9e38b925c896ddc2cc9bccc 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -21,6 +21,7 @@ EXPECT_NAMES=\
fcntl/fcntl \
fnmatch \
futimens \
+ iso646 \
libgen \
locale \
math \
diff --git a/tests/expected/bins_static/iso646.stderr b/tests/expected/bins_static/iso646.stderr
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/tests/expected/bins_static/iso646.stdout b/tests/expected/bins_static/iso646.stdout
new file mode 100644
index 0000000000000000000000000000000000000000..5f8a399fe8ad1ccd45fb47084578909ee978219e
--- /dev/null
+++ b/tests/expected/bins_static/iso646.stdout
@@ -0,0 +1,33 @@
+0 and 0: 0
+1 and 0: 0
+0 and 1: 0
+1 and 1: 1
+0 and_eq 0: 0
+1 and_eq 0: 0
+0 and_eq 1: 0
+1 and_eq 1: 1
+a bitand b: 8
+a bitor b: 14
+compl a: 245
+not 0: 1
+not 1: 0
+0 not_eq 0: 0
+1 not_eq 0: 1
+0 not_eq 1: 0
+1 not_eq 1: 1
+0 or 0: 0
+1 or 0: 1
+0 or 1: 1
+1 or 1: 1
+0 or_eq 0: 0
+1 or_eq 0: 1
+0 or_eq 1: 1
+1 or_eq 1: 1
+0 xor 0: 0
+1 xor 0: 1
+0 xor 1: 1
+1 xor 1: 0
+0 xor_eq 0: 0
+1 xor_eq 0: 1
+0 xor_eq 1: 1
+1 xor_eq 1: 0
diff --git a/tests/iso646.c b/tests/iso646.c
new file mode 100644
index 0000000000000000000000000000000000000000..82f544807fa31bc7b7fec7d4bfb9ba3d61185a6d
--- /dev/null
+++ b/tests/iso646.c
@@ -0,0 +1,92 @@
+#include <iso646.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "test_helpers.h"
+
+int main() {
+ uint8_t a_bits = 0xa; // 0b0000_1010
+ uint8_t b_bits = 0xc; // 0b0000_1100
+
+ uint8_t c_bits;
+ int c_bool;
+
+ printf("0 and 0: %d\n", 0 and 0);
+ printf("1 and 0: %d\n", 1 and 0);
+ printf("0 and 1: %d\n", 0 and 1);
+ printf("1 and 1: %d\n", 1 and 1);
+
+ c_bool = 0;
+ c_bool and_eq 0;
+ printf("0 and_eq 0: %d\n", c_bool);
+ c_bool = 1;
+ c_bool and_eq 0;
+ printf("1 and_eq 0: %d\n", c_bool);
+ c_bool = 0;
+ c_bool and_eq 1;
+ printf("0 and_eq 1: %d\n", c_bool);
+ c_bool = 1;
+ c_bool and_eq 1;
+ printf("1 and_eq 1: %d\n", c_bool);
+
+ c_bits = a_bits bitand b_bits;
+ printf("a bitand b: %d\n", c_bits);
+
+ c_bits = a_bits bitor b_bits;
+ printf("a bitor b: %d\n", c_bits);
+
+ c_bits = compl a_bits;
+ printf("compl a: %d\n", c_bits);
+
+ printf("not 0: %d\n", not 0);
+ printf("not 1: %d\n", not 1);
+
+ c_bool = 0;
+ c_bool not_eq 0;
+ printf("0 not_eq 0: %d\n", c_bool);
+ c_bool = 1;
+ c_bool not_eq 0;
+ printf("1 not_eq 0: %d\n", c_bool);
+ c_bool = 0;
+ c_bool not_eq 1;
+ printf("0 not_eq 1: %d\n", c_bool);
+ c_bool = 1;
+ c_bool not_eq 1;
+ printf("1 not_eq 1: %d\n", c_bool);
+
+ printf("0 or 0: %d\n", 0 or 0);
+ printf("1 or 0: %d\n", 1 or 0);
+ printf("0 or 1: %d\n", 0 or 1);
+ printf("1 or 1: %d\n", 1 or 1);
+
+ c_bool = 0;
+ c_bool or_eq 0;
+ printf("0 or_eq 0: %d\n", c_bool);
+ c_bool = 1;
+ c_bool or_eq 0;
+ printf("1 or_eq 0: %d\n", c_bool);
+ c_bool = 0;
+ c_bool or_eq 1;
+ printf("0 or_eq 1: %d\n", c_bool);
+ c_bool = 1;
+ c_bool or_eq 1;
+ printf("1 or_eq 1: %d\n", c_bool);
+
+ printf("0 xor 0: %d\n", 0 xor 0);
+ printf("1 xor 0: %d\n", 1 xor 0);
+ printf("0 xor 1: %d\n", 0 xor 1);
+ printf("1 xor 1: %d\n", 1 xor 1);
+
+ c_bool = 0;
+ c_bool xor_eq 0;
+ printf("0 xor_eq 0: %d\n", c_bool);
+ c_bool = 1;
+ c_bool xor_eq 0;
+ printf("1 xor_eq 0: %d\n", c_bool);
+ c_bool = 0;
+ c_bool xor_eq 1;
+ printf("0 xor_eq 1: %d\n", c_bool);
+ c_bool = 1;
+ c_bool xor_eq 1;
+ printf("1 xor_eq 1: %d\n", c_bool);
+}