diff --git a/Foundation/src/Error.cpp b/Foundation/src/Error.cpp
index 6a8afb705..00991fc0b 100644
--- a/Foundation/src/Error.cpp
+++ b/Foundation/src/Error.cpp
@@ -69,7 +69,10 @@ namespace Poco {
 		   without -D_GNU_SOURCE is needed, otherwise the GNU version is
 		   preferred.
 		*/
-#if defined _GNU_SOURCE && !POCO_ANDROID
+		/* The GNU version of strerror_r is non-portable and not
+		   available on the musl C library.
+		 */
+#if (defined __GLIBC__ || defined __UCLIBC__) && defined _GNU_SOURCE && !POCO_ANDROID
 		char errmsg[256] = "";
 		return std::string(strerror_r(errorCode, errmsg, 256));
 #elif (_XOPEN_SOURCE >= 600) || POCO_ANDROID