diff --git a/configure.ac b/configure.ac
index d3748e894..2ceb3894b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -506,6 +506,7 @@ case "${host_os}" in
       AC_DEFINE([SDK_13_0], 130000, [SDK_VERS value for Xcode SDK macOS 13.0 / iOS 16])
       AC_DEFINE([SDK_14_0], 140000, [SDK_VERS value for Xcode SDK macOS 14.0 / iOS 17])
       AC_DEFINE([SDK_15_0], 150000, [SDK_VERS value for Xcode SDK macOS 15.0 / iOS 18])
+      AC_DEFINE([SDK_26_0], 260000, [SDK_VERS value for Xcode SDK macOS / iOS 26])
 
       # Substitute the Xcode include path detected earlier
       AC_SUBST(SDK_INC_DIR, [$xcodedir_inc])
@@ -721,6 +722,9 @@ case "${host_os}" in
         macosx-15.*|iphoneos-18.*)
           AC_DEFINE([SDK_VERS], SDK_15_0, [SDK version])
           ;;
+        *-26.*)
+          AC_DEFINE([SDK_VERS], SDK_26_0, [SDK version])
+          ;;
         legacy)
           AC_DEFINE([SDK_VERS], SDK_10_XX, [SDK version])
           ;;
diff --git a/memcheck/tests/wcpncpy.stderr.exp b/memcheck/tests/wcpncpy.stderr.exp
index 3d68ff1c1..97f5fa8c7 100644
--- a/memcheck/tests/wcpncpy.stderr.exp
+++ b/memcheck/tests/wcpncpy.stderr.exp
@@ -1,19 +1,19 @@
 Conditional jump or move depends on uninitialised value(s)
-   at 0x........: wcpncpy (vg_replace_strmem.c:2605)
+   at 0x........: wcpncpy (vg_replace_strmem.c:...)
    by 0x........: main (wcpncpy.c:14)
 
 Invalid write of size 4
-   at 0x........: wcpncpy (vg_replace_strmem.c:2605)
+   at 0x........: wcpncpy (vg_replace_strmem.c:...)
    by 0x........: main (wcpncpy.c:27)
  Address 0x........ is 20 bytes inside a block of size 22 alloc'd
    at 0x........: malloc (vg_replace_malloc.c:...)
    by 0x........: main (wcpncpy.c:10)
 
 Source and destination overlap in wcpncpy(0x........, 0x........)
-   at 0x........: wcpncpy (vg_replace_strmem.c:2605)
+   at 0x........: wcpncpy (vg_replace_strmem.c:...)
    by 0x........: main (wcpncpy.c:35)
 
 Source and destination overlap in wcpncpy(0x........, 0x........)
-   at 0x........: wcpncpy (vg_replace_strmem.c:2605)
+   at 0x........: wcpncpy (vg_replace_strmem.c:...)
    by 0x........: main (wcpncpy.c:43)
 
diff --git a/shared/vg_replace_strmem.c b/shared/vg_replace_strmem.c
index e584d0c01..7fb22fbc8 100644
--- a/shared/vg_replace_strmem.c
+++ b/shared/vg_replace_strmem.c
@@ -2603,6 +2603,9 @@ static inline void my_exit ( int x )
 
 #if defined(VGO_linux) || defined(VGO_freebsd) || defined(VGO_solaris)
  WCPNCPY(VG_Z_LIBC_SONAME, wcpncpy)
+#elif defined(VGO_darwin)
+ WCPNCPY(libsystemZucZddylib, wcpncpy)
+#else
 #endif
 
 /*----------------------- wcscat ----------------------*/
diff --git a/tests/filter_stderr_basic.in b/tests/filter_stderr_basic.in
index 81b8ccf83..49ccf766e 100644
--- a/tests/filter_stderr_basic.in
+++ b/tests/filter_stderr_basic.in
@@ -62,6 +62,7 @@ $SED "/sh: [1-9][0-9]*: \(Memory fault\|Alarm call\|Terminated\|Killed\|Abort\)/
 # Translate intercepted glibc functions back to their canonical name
 perl -p -e "s/: memcpy\@\@?GLIBC_[.1-9]+ \(vg_replace_strmem.c:.*?\)/: memcpy \(vg_replace_strmem.c:...\)/" |
 $SED -e "s/: \(__GI_\|__\|\)\(memcmp\|memcpy\|strcpy\|strncpy\|strchr\|strrchr\)\(\|_sse4_1\|_sse42\|_sse2_unaligned\|_sse2\) (vg_replace_strmem.c:/: \2 (vg_replace_strmem.c:/" |
+$SED -e "s/: wcpncpy \(vg_replace_strmem.c:.*?\)/: wcpncpy \(vg_replace_strmem.c:...\)/" |
 
 # Remove any ": dumping core" message as the user might have a
 # limit set that prevents the core dump