diff --git a/ndk/platforms/android-20/arch-arm/include/asm/signal.h b/ndk/platforms/android-20/arch-arm/include/asm/signal.h
index 512e22a25..fd39aaa9a 100644
--- a/ndk/platforms/android-20/arch-arm/include/asm/signal.h
+++ b/ndk/platforms/android-20/arch-arm/include/asm/signal.h
@@ -66,8 +66,8 @@ typedef unsigned long sigset_t;
 #define SIGSYS 31
 #define SIGUNUSED 31
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIGRTMIN 32
-#define SIGRTMAX _KERNEL__NSIG
+#define __SIGRTMIN 32
+#define __SIGRTMAX _KERNEL__NSIG
 #define SIGSWI 32
 #define SA_NOCLDSTOP 0x00000001
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/ndk/platforms/android-20/arch-mips/include/asm/signal.h b/ndk/platforms/android-20/arch-mips/include/asm/signal.h
index 53f501513..b774a66f3 100644
--- a/ndk/platforms/android-20/arch-mips/include/asm/signal.h
+++ b/ndk/platforms/android-20/arch-mips/include/asm/signal.h
@@ -71,8 +71,8 @@ typedef unsigned long old_sigset_t;
 #define SIGXCPU 30
 #define SIGXFSZ 31
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIGRTMIN 32
-#define SIGRTMAX _KERNEL__NSIG
+#define __SIGRTMIN 32
+#define __SIGRTMAX _KERNEL__NSIG
 #define SA_ONSTACK 0x08000000
 #define SA_RESETHAND 0x80000000
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/ndk/platforms/android-20/arch-x86/include/asm/signal.h b/ndk/platforms/android-20/arch-x86/include/asm/signal.h
index 6f5b4354d..308c7a934 100644
--- a/ndk/platforms/android-20/arch-x86/include/asm/signal.h
+++ b/ndk/platforms/android-20/arch-x86/include/asm/signal.h
@@ -71,8 +71,8 @@ typedef unsigned long sigset_t;
 #define SIGSYS 31
 #define SIGUNUSED 31
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIGRTMIN 32
-#define SIGRTMAX _KERNEL__NSIG
+#define __SIGRTMIN 32
+#define __SIGRTMAX _KERNEL__NSIG
 #define SA_NOCLDSTOP 0x00000001u
 #define SA_NOCLDWAIT 0x00000002u
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
diff --git a/ndk/platforms/android-20/include/asm-generic/signal.h b/ndk/platforms/android-20/include/asm-generic/signal.h
index fe7d9a097..e103240b1 100644
--- a/ndk/platforms/android-20/include/asm-generic/signal.h
+++ b/ndk/platforms/android-20/include/asm-generic/signal.h
@@ -66,9 +66,9 @@
 #define SIGSYS 31
 #define SIGUNUSED 31
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define SIGRTMIN 32
-#ifndef SIGRTMAX
-#define SIGRTMAX _KERNEL__NSIG
+#define __SIGRTMIN 32
+#ifndef __SIGRTMAX
+#define __SIGRTMAX _KERNEL__NSIG
 #endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SA_NOCLDSTOP 0x00000001
diff --git a/ndk/sources/android/libportable/arch-mips/signal.c b/ndk/sources/android/libportable/arch-mips/signal.c
index c37f6d260..e84b2fc33 100644
--- a/ndk/sources/android/libportable/arch-mips/signal.c
+++ b/ndk/sources/android/libportable/arch-mips/signal.c
@@ -32,6 +32,13 @@
 #define PORTABLE_TAG "signal_portable"
 #include <log_portable.h>
 
+/* for build against old platforms when SIGRT* defined instead of __SIGRT* */
+#ifndef __SIGRTMIN
+#define __SIGRTMIN SIGRTMIN
+#endif
+#ifndef __SIGRTMAX
+#define __SIGRTMAX SIGRTMAX
+#endif
 
 #if SIGBUS_PORTABLE == SIGBUS
 #error Bad build environment