diff --git a/icu4c/source/test/cintltst/cbiapts.c b/icu4c/source/test/cintltst/cbiapts.c
index 093db2e36e4..eaf43cf3365 100644
--- a/icu4c/source/test/cintltst/cbiapts.c
+++ b/icu4c/source/test/cintltst/cbiapts.c
@@ -22,7 +22,7 @@
 
 #if !UCONFIG_NO_BREAK_ITERATION
 
-#include <malloc.h>
+#include <stdlib.h>
 #include "unicode/uloc.h"
 #include "unicode/ubrk.h"
 #include "unicode/ustring.h"
diff --git a/icu4c/source/test/cintltst/ccaltst.c b/icu4c/source/test/cintltst/ccaltst.c
index 8d4be94ed2c..5fe45fdc45f 100644
--- a/icu4c/source/test/cintltst/ccaltst.c
+++ b/icu4c/source/test/cintltst/ccaltst.c
@@ -18,7 +18,7 @@
 
 #if !UCONFIG_NO_FORMATTING
 
-#include <malloc.h>
+#include <stdlib.h>
 
 #include "unicode/uloc.h"
 #include "unicode/ucal.h"
diff --git a/icu4c/source/test/cintltst/cmsgtst.c b/icu4c/source/test/cintltst/cmsgtst.c
index 709bed96634..b2812acde5b 100644
--- a/icu4c/source/test/cintltst/cmsgtst.c
+++ b/icu4c/source/test/cintltst/cmsgtst.c
@@ -18,7 +18,7 @@
 
 #if !UCONFIG_NO_FORMATTING
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <string.h>
 #include "unicode/uloc.h"
 #include "unicode/umsg.h"
diff --git a/icu4c/source/test/cintltst/usettest.c b/icu4c/source/test/cintltst/usettest.c
index 17ec390317b..5a2e1c0a20f 100644
--- a/icu4c/source/test/cintltst/usettest.c
+++ b/icu4c/source/test/cintltst/usettest.c
@@ -6,11 +6,11 @@
 * $Source: /xsrl/Nsvn/icu/icu/source/test/cintltst/usettest.c,v $ 
 **********************************************************************
 */
-#include <malloc.h>
-#include <string.h>
 #include "unicode/uset.h"
 #include "unicode/ustring.h"
 #include "cintltst.h"
+#include <stdlib.h>
+#include <string.h>
 
 #define TEST(x) addTest(root, &x, "uset/" # x)