diff --git a/changelogs/unreleased/gh-8887-fix-interval-int64.md b/changelogs/unreleased/gh-8887-fix-interval-int64.md
new file mode 100644
index 000000000000..20142aea1100
--- /dev/null
+++ b/changelogs/unreleased/gh-8887-fix-interval-int64.md
@@ -0,0 +1,4 @@
+## bugfix/msgpack
+
+* Fixed decoding datetime intervals with fields larger than possible int32
+  values (gh-8887).
diff --git a/src/lib/core/mp_interval.c b/src/lib/core/mp_interval.c
index 6d633d0ea837..2c0486224c37 100644
--- a/src/lib/core/mp_interval.c
+++ b/src/lib/core/mp_interval.c
@@ -116,7 +116,7 @@ interval_unpack(const char **data, uint32_t len, struct interval *itv)
 	memset(itv, 0, sizeof(*itv));
 	for (uint32_t i = 0; i < count; ++i) {
 		uint32_t field = mp_load_u8(data);
-		int32_t value;
+		int64_t value;
 		enum mp_type type = mp_typeof(**data);
 		if (type == MP_UINT) {
 			if (mp_check_uint(*data, end) > 0)
@@ -127,7 +127,7 @@ interval_unpack(const char **data, uint32_t len, struct interval *itv)
 		} else {
 			return NULL;
 		}
-		if (mp_read_int32(data, &value) != 0)
+		if (mp_read_int64(data, &value) != 0)
 			return NULL;
 		switch (field) {
 		case FIELD_YEAR:
@@ -155,7 +155,7 @@ interval_unpack(const char **data, uint32_t len, struct interval *itv)
 			itv->nsec = value;
 			break;
 		case FIELD_ADJUST:
-			if (value > (int32_t)DT_SNAP)
+			if (value > (int64_t)DT_SNAP)
 				return NULL;
 			itv->adjust = (dt_adjust_t)value;
 			break;
diff --git a/test/unit/interval.c b/test/unit/interval.c
index 6a3d2502c340..135e40e8ae57 100644
--- a/test/unit/interval.c
+++ b/test/unit/interval.c
@@ -96,11 +96,62 @@ test_interval_encode_decode(void)
 	is(result.adjust, DT_EXCESS, "Adjust value is right");
 }
 
+static void
+test_interval_encode_decode_limits(void)
+{
+	struct interval itv;
+	memset(&itv, 0, sizeof(itv));
+	struct interval result;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.day = -4295055470;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.day = 4295055470;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.hour = -103081331286;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.hour = 103081331286;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.min = -6184879877160;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.min = 6184879877160;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.sec = -371092792629600;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.sec = 371092792629600;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.nsec = -2147483647;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+
+	itv.nsec = 2147483647;
+	interval_mp_recode(&itv, &result);
+	ok(is_interval_equal(&itv, &result), "Intervals are equal.");
+}
+
 int
 main(void)
 {
-	plan(21);
+	plan(32);
 	test_interval_sizeof();
 	test_interval_encode_decode();
+	test_interval_encode_decode_limits();
 	return check_plan();
 }