diff --git a/libc/include/bits/posix_limits.h b/libc/include/bits/posix_limits.h
index 8dfea52..452f5f6 100644
--- a/libc/include/bits/posix_limits.h
+++ b/libc/include/bits/posix_limits.h
@@ -37,7 +37,7 @@
 
 #define __BIONIC_POSIX_FEATURE_MISSING (-1)
 #define __BIONIC_POSIX_FEATURE_SINCE(level) \
-    (((__ANDROID_API__) >= level) ? _POSIX_VERSION : __BIONIC_POSIX_FEATURE_MISSING)
+    (((__ANDROID_API__) >= (level)) ? _POSIX_VERSION : __BIONIC_POSIX_FEATURE_MISSING)
 
 /* Availability macros. */
 /* See http://man7.org/linux/man-pages/man7/posixoptions.7.html for documentation. */
@@ -104,15 +104,15 @@
 #define _POSIX2_UPE                 __BIONIC_POSIX_FEATURE_MISSING
 
 #if defined(__LP64__)
-#define _POSIX_V7_ILP32_OFF32       -1
-#define _POSIX_V7_ILP32_OFFBIG      -1
+#define _POSIX_V7_ILP32_OFF32      (-1)
+#define _POSIX_V7_ILP32_OFFBIG     (-1)
 #define _POSIX_V7_LP64_OFF64         1
 #define _POSIX_V7_LPBIG_OFFBIG       1
 #else
 #define _POSIX_V7_ILP32_OFF32        1
-#define _POSIX_V7_ILP32_OFFBIG      -1
-#define _POSIX_V7_LP64_OFF64        -1
-#define _POSIX_V7_LPBIG_OFFBIG      -1
+#define _POSIX_V7_ILP32_OFFBIG     (-1)
+#define _POSIX_V7_LP64_OFF64       (-1)
+#define _POSIX_V7_LPBIG_OFFBIG     (-1)
 #endif
 
 #define _XOPEN_CRYPT                __BIONIC_POSIX_FEATURE_MISSING
diff --git a/libc/include/malloc.h b/libc/include/malloc.h
index aa046b9..ba0af3c 100644
--- a/libc/include/malloc.h
+++ b/libc/include/malloc.h
@@ -162,14 +162,14 @@
  *
  * Available since API level 27.
  */
-#define M_DECAY_TIME -100
+#define M_DECAY_TIME (-100)
 /**
  * mallopt() option to immediately purge any memory not in use. This
  * will release the memory back to the kernel. The value is ignored.
  *
  * Available since API level 28.
  */
-#define M_PURGE -101
+#define M_PURGE (-101)
 
 /**
  * [mallopt(3)](http://man7.org/linux/man-pages/man3/mallopt.3.html) modifies
diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 331e92c..8bc897a 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -68,7 +68,7 @@
 #define PTHREAD_ONCE_INIT 0
 
 #if __ANDROID_API__ >= 24
-#define PTHREAD_BARRIER_SERIAL_THREAD -1
+#define PTHREAD_BARRIER_SERIAL_THREAD (-1)
 #endif
 
 #if defined(__LP64__)
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 9e214e5..b4556a7 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -303,7 +303,7 @@
 
 /* Intended for use in evaluated contexts. */
 #define __bos_dynamic_check_impl_and(bos_val, op, index, cond) \
-  (bos_val == __BIONIC_FORTIFY_UNKNOWN_SIZE ||                 \
+  ((bos_val) == __BIONIC_FORTIFY_UNKNOWN_SIZE ||                 \
    (__builtin_constant_p(index) && bos_val op index && (cond)))
 
 #define __bos_dynamic_check_impl(bos_val, op, index) \