diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index a116e605d..67900c46c 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -44,7 +44,7 @@
 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
 #error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
 #endif
 
diff --git a/library/net.c b/library/net.c
index 8b96321bc..93bf0468b 100644
--- a/library/net.c
+++ b/library/net.c
@@ -28,7 +28,7 @@
 #if defined(MBEDTLS_NET_C)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
 #error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
 #endif
 
diff --git a/library/timing.c b/library/timing.c
index a7c7ff027..56f29bdb5 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -39,7 +39,7 @@
 #if !defined(MBEDTLS_TIMING_ALT)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
 #error "This module only works on Unix and Windows, see MBEDTLS_TIMING_C in config.h"
 #endif