diff --git a/platforms/common/include/px4_platform_common/posix.h b/platforms/common/include/px4_platform_common/posix.h
index e8664c13fe..b1cada1019 100644
--- a/platforms/common/include/px4_platform_common/posix.h
+++ b/platforms/common/include/px4_platform_common/posix.h
@@ -131,7 +131,7 @@ __END_DECLS
 // we often run out of stack space when pointers are larger than 4 bytes.
 // Double the stack size on posix when we're on a 64-bit architecture.
 // Most full-scale OS use 1-4K of memory from the stack themselves
-#define PX4_STACK_ADJUSTED(_s) (_s * (sizeof(void *) >> 2) + PX4_STACK_OVERHEAD)
+#define PX4_STACK_ADJUSTED(_s) ((_s) * (sizeof(void *) >> 2) + PX4_STACK_OVERHEAD)
 
 __BEGIN_DECLS
 
diff --git a/platforms/posix/include/windows_shim/fcntl.h b/platforms/posix/include/windows_shim/fcntl.h
index cf201f330b..a1c192452e 100644
--- a/platforms/posix/include/windows_shim/fcntl.h
+++ b/platforms/posix/include/windows_shim/fcntl.h
@@ -103,7 +103,7 @@
 #undef ERROR
 #endif
 #if defined(__PX4_POSIX)
-#define ERROR -1
+#define ERROR (-1)
 #endif
 #ifdef IGNORE
 #undef IGNORE