diff --git a/icu4c/source/test/cintltst/ccapitst.c b/icu4c/source/test/cintltst/ccapitst.c
index c8bbea53917..fbcf7b6c462 100644
--- a/icu4c/source/test/cintltst/ccapitst.c
+++ b/icu4c/source/test/cintltst/ccapitst.c
@@ -15,6 +15,7 @@
 ******************************************************************************
 */
 
+#include <stdalign.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -37,12 +38,6 @@
 #define MAX_FILE_LEN 1024*20
 #define UCS_FILE_NAME_SIZE 512
 
-#if __STDC_VERSION__ < 201112
-# define alignof(type) offsetof (struct { char c; type member; }, member)
-#elif __STDC_VERSION__ < 202311
-# include <stdalign.h>
-#endif
-
 /*returns an action other than the one provided*/
 #if !UCONFIG_NO_LEGACY_CONVERSION
 static UConverterFromUCallback otherUnicodeAction(UConverterFromUCallback MIA);