diff --git a/ndk/platforms/android-21/arch-arm64/symbols/libc.so.variables.txt b/ndk/platforms/android-21/arch-arm64/symbols/libc.so.variables.txt
index 3a7cfc91a..ea0167a50 100644
--- a/ndk/platforms/android-21/arch-arm64/symbols/libc.so.variables.txt
+++ b/ndk/platforms/android-21/arch-arm64/symbols/libc.so.variables.txt
@@ -1,4 +1,3 @@
-__isthreaded
 __p_class_syms
 __p_type_syms
 __progname
diff --git a/ndk/platforms/android-21/arch-mips64/symbols/libc.so.variables.txt b/ndk/platforms/android-21/arch-mips64/symbols/libc.so.variables.txt
index 3a7cfc91a..ea0167a50 100644
--- a/ndk/platforms/android-21/arch-mips64/symbols/libc.so.variables.txt
+++ b/ndk/platforms/android-21/arch-mips64/symbols/libc.so.variables.txt
@@ -1,4 +1,3 @@
-__isthreaded
 __p_class_syms
 __p_type_syms
 __progname
diff --git a/ndk/platforms/android-21/arch-x86_64/symbols/libc.so.variables.txt b/ndk/platforms/android-21/arch-x86_64/symbols/libc.so.variables.txt
index 3a7cfc91a..ea0167a50 100644
--- a/ndk/platforms/android-21/arch-x86_64/symbols/libc.so.variables.txt
+++ b/ndk/platforms/android-21/arch-x86_64/symbols/libc.so.variables.txt
@@ -1,4 +1,3 @@
-__isthreaded
 __p_class_syms
 __p_type_syms
 __progname