diff --git a/mysql-test/main/func_extract.result b/mysql-test/main/func_extract.result
index dc71f6ae27a..7c1fd5009ca 100644
--- a/mysql-test/main/func_extract.result
+++ b/mysql-test/main/func_extract.result
@@ -1470,5 +1470,13 @@ DROP FUNCTION params;
 DROP FUNCTION select01;
 DROP FUNCTION select02;
 #
+# MDEV-32891 Assertion `value <= ((ulonglong) 0xFFFFFFFFL) * 10000ULL' failed in str_to_DDhhmmssff_internal
+#
+SELECT EXTRACT(HOUR_MICROSECOND FROM '42949672955000x1');
+EXTRACT(HOUR_MICROSECOND FROM '42949672955000x1')
+NULL
+Warnings:
+Warning	1292	Incorrect interval value: '42949672955000x1'
+#
 # End of 10.5 tests
 #
diff --git a/mysql-test/main/func_extract.test b/mysql-test/main/func_extract.test
index dd808443f58..6167780b9bf 100644
--- a/mysql-test/main/func_extract.test
+++ b/mysql-test/main/func_extract.test
@@ -511,6 +511,13 @@ DROP FUNCTION params;
 DROP FUNCTION select01;
 DROP FUNCTION select02;
 
+--echo #
+--echo # MDEV-32891 Assertion `value <= ((ulonglong) 0xFFFFFFFFL) * 10000ULL' failed in str_to_DDhhmmssff_internal
+--echo #
+
+SELECT EXTRACT(HOUR_MICROSECOND FROM '42949672955000x1');
+
+
 --echo #
 --echo # End of 10.5 tests
 --echo #
diff --git a/sql-common/my_time.c b/sql-common/my_time.c
index eff39cd5eae..2f74235614c 100644
--- a/sql-common/my_time.c
+++ b/sql-common/my_time.c
@@ -961,7 +961,7 @@ str_to_DDhhmmssff_internal(my_bool neg, const char *str, size_t length,
   {
     /* String given as one number; assume HHMMSS format */
     date[0]= 0;
-    DBUG_ASSERT(value <= ((ulonglong) UINT_MAX32) * 10000ULL);
+    DBUG_ASSERT(value / 10000 <= ((ulonglong) UINT_MAX32));
     date[1]= (ulong) (value/10000);
     date[2]= (ulong) (value/100 % 100);
     date[3]= (ulong) (value % 100);