diff --git a/pkgs/development/libraries/icu/base.nix b/pkgs/development/libraries/icu/base.nix
index 6d9a9725cc2..2c8392c8bac 100644
--- a/pkgs/development/libraries/icu/base.nix
+++ b/pkgs/development/libraries/icu/base.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
   '';
 
   # https://sourceware.org/glibc/wiki/Release/2.26#Removal_of_.27xlocale.h.27
-  postPatch = if stdenv ? glibc
+  postPatch = if (stdenv.hostPlatform.libc == "glibc" || stdenv.hostPlatform.libc == "musl")
     then "substituteInPlace i18n/digitlst.cpp --replace '<xlocale.h>' '<locale.h>'"
     else null; # won't find locale_t on darwin