diff --git a/src/header/time/mod.rs b/src/header/time/mod.rs
index ff0c2a2283..cebe2ac512 100644
--- a/src/header/time/mod.rs
+++ b/src/header/time/mod.rs
@@ -66,22 +66,30 @@ static mut ASCTIME: [c_char; 26] = [0; 26];
 
 // We don't handle timezones, so just initialize the timezone info to GMT
 // TODO: timezones
-#[repr(C)]
+#[repr(transparent)]
 pub struct TzName {
-    tz: [*const c_char; 2],
+    tz: [*mut c_char; 2],
 }
 
 unsafe impl Sync for TzName {}
 
+static mut TZ_STD: [c_char; 8] = [b'U' as c_char, b'T' as c_char, b'C' as c_char, 0, 0, 0, 0, 0];
+static mut TZ_DST: [c_char; 8] = [b'U' as c_char, b'T' as c_char, b'C' as c_char, 0, 0, 0, 0, 0];
+
 #[allow(non_upper_case_globals)]
 #[no_mangle]
-pub static tzname: TzName = TzName { tz: [UTC, UTC] };
+pub static mut tzname: TzName = TzName {
+    tz: [
+        unsafe { TZ_DST.as_mut_ptr() },
+        unsafe { TZ_DST.as_mut_ptr() },
+    ] };
+
 #[allow(non_upper_case_globals)]
 #[no_mangle]
-pub static daylight: c_int = 0;
+pub static mut daylight: c_int = 0;
 #[allow(non_upper_case_globals)]
 #[no_mangle]
-pub static timezone: c_long = 0;
+pub static mut timezone: c_long = 0;
 
 #[repr(C)]
 pub struct itimerspec {
@@ -487,7 +495,7 @@ pub extern "C" fn timer_delete(timerid: timer_t) -> c_int {
 
 #[no_mangle]
 pub extern "C" fn tzset() {
-    // no-op because we only do GMT
+    // no-op because we only do UTC
     // TODO: timezones, parse env var TZ
 }
 
diff --git a/tests/Makefile b/tests/Makefile
index 4c08211820..d28dc313b9 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -84,6 +84,7 @@ EXPECT_NAMES=\
 	time/mktime \
 	time/strftime \
 	time/time \
+	time/tzset \
 	tls \
 	unistd/access \
 	unistd/brk \
diff --git a/tests/expected/bins_static/time/tzset.stderr b/tests/expected/bins_static/time/tzset.stderr
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/expected/bins_static/time/tzset.stdout b/tests/expected/bins_static/time/tzset.stdout
new file mode 100644
index 0000000000..9962d8acc0
--- /dev/null
+++ b/tests/expected/bins_static/time/tzset.stdout
@@ -0,0 +1 @@
+tzname[0] UTC, tzname[1] UTC, daylight 0, timezone 0
diff --git a/tests/time/tzset.c b/tests/time/tzset.c
new file mode 100644
index 0000000000..87fa15f719
--- /dev/null
+++ b/tests/time/tzset.c
@@ -0,0 +1,16 @@
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern int daylight;
+extern long timezone;
+extern char *tzname[2];
+void tzset(void);
+
+int main(void) {
+    tzset();
+    printf("tzname[0] %s, tzname[1] %s, daylight %d, timezone %ld\n",
+        tzname[0], tzname[1], daylight, timezone);
+    return 0;
+}