diff --git a/include/acpi/platform/acenv.h b/include/acpi/platform/acenv.h
index 72f85b4bdc449f1ce06519657a56bc937423b2a0..86b5a8447606c4b4d1c87ac7c9b76146babd1dd7 100644
--- a/include/acpi/platform/acenv.h
+++ b/include/acpi/platform/acenv.h
@@ -219,6 +219,9 @@
 #elif defined(__HAIKU__)
 #include "achaiku.h"
 
+#elif defined(__QNX__)
+#include "acqnx.h"
+
 #else
 
 /* Unknown environment */
diff --git a/tools/power/acpi/os_specific/service_layers/osunixmap.c b/tools/power/acpi/os_specific/service_layers/osunixmap.c
index 3818fd07e50fd1e74a8ea2450bbfa29bff4957ba..cbfbce18783d322978ffa32dea43f4d6d96a7f20 100644
--- a/tools/power/acpi/os_specific/service_layers/osunixmap.c
+++ b/tools/power/acpi/os_specific/service_layers/osunixmap.c
@@ -54,7 +54,7 @@ ACPI_MODULE_NAME("osunixmap")
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif
-#if defined(_dragon_fly) || defined(_free_BSD)
+#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX)
 #define MMAP_FLAGS          MAP_SHARED
 #else
 #define MMAP_FLAGS          MAP_PRIVATE