diff --git a/lib/common/zstd_deps.h b/lib/common/zstd_deps.h
index f41a973c3..8a9c7cc53 100644
--- a/lib/common/zstd_deps.h
+++ b/lib/common/zstd_deps.h
@@ -31,7 +31,7 @@
  */
 #if defined(__linux) || defined(__linux__) || defined(linux) || defined(__gnu_linux__) || \
     defined(__CYGWIN__) || defined(__MSYS__)
-#if !defined(_GNU_SOURCE)
+#if !defined(_GNU_SOURCE) && !defined(__ANDROID__) /* NDK doesn't ship qsort_r(). */
 #define _GNU_SOURCE
 #endif
 #endif
diff --git a/lib/dictBuilder/cover.c b/lib/dictBuilder/cover.c
index 386a4d572..2ef33c73e 100644
--- a/lib/dictBuilder/cover.c
+++ b/lib/dictBuilder/cover.c
@@ -24,7 +24,7 @@
 /* qsort_r is an extension. */
 #if defined(__linux) || defined(__linux__) || defined(linux) || defined(__gnu_linux__) || \
     defined(__CYGWIN__) || defined(__MSYS__)
-#if !defined(_GNU_SOURCE)
+#if !defined(_GNU_SOURCE) && !defined(__ANDROID__) /* NDK doesn't ship qsort_r(). */
 #define _GNU_SOURCE
 #endif
 #endif