diff --git a/src/or/onion_fast.h b/src/or/onion_fast.h
index 0c2a475376..8c078378d2 100644
--- a/src/or/onion_fast.h
+++ b/src/or/onion_fast.h
@@ -13,7 +13,7 @@
 #define TOR_ONION_FAST_H
 
 #define CREATE_FAST_LEN DIGEST_LEN
-#define CREATED_FAST_LEN DIGEST_LEN*2
+#define CREATED_FAST_LEN (DIGEST_LEN*2)
 
 typedef struct fast_handshake_state_t {
   uint8_t state[DIGEST_LEN];
diff --git a/src/or/or.h b/src/or/or.h
index a0a921a9f4..04640d050a 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -4586,12 +4586,12 @@ typedef struct rend_encoded_v2_service_descriptor_t {
  * sooner.)
  *
  * XXX023 Should this be configurable? */
-#define INTRO_POINT_LIFETIME_MIN_SECONDS 18*60*60
+#define INTRO_POINT_LIFETIME_MIN_SECONDS (18*60*60)
 /** The maximum number of seconds that an introduction point will last
  * before expiring due to old age.
  *
  * XXX023 Should this be configurable? */
-#define INTRO_POINT_LIFETIME_MAX_SECONDS 24*60*60
+#define INTRO_POINT_LIFETIME_MAX_SECONDS (24*60*60)
 
 /** Introduction point information.  Used both in rend_service_t (on
  * the service side) and in rend_service_descriptor_t (on both the
diff --git a/src/or/rendservice.c b/src/or/rendservice.c
index f85ac2c03b..10d232c039 100644
--- a/src/or/rendservice.c
+++ b/src/or/rendservice.c
@@ -88,7 +88,7 @@ typedef struct rend_service_port_config_t {
 
 /** How many seconds should we wait for new HS descriptors to reach
  * our clients before we close an expiring intro point? */
-#define INTRO_POINT_EXPIRATION_GRACE_PERIOD 5*60
+#define INTRO_POINT_EXPIRATION_GRACE_PERIOD (5*60)
 
 /** Represents a single hidden service running at this OP. */
 typedef struct rend_service_t {
diff --git a/src/or/rephist.c b/src/or/rephist.c
index 34caa4b518..1bee6459cc 100644
--- a/src/or/rephist.c
+++ b/src/or/rephist.c
@@ -1549,7 +1549,7 @@ rep_hist_get_bandwidth_lines(void)
   /* [dirreq-](read|write)-history yyyy-mm-dd HH:MM:SS (n s) n,n,n... */
 /* The n,n,n part above. Largest representation of a uint64_t is 20 chars
  * long, plus the comma. */
-#define MAX_HIST_VALUE_LEN 21*NUM_TOTALS
+#define MAX_HIST_VALUE_LEN (21*NUM_TOTALS)
   len = (67+MAX_HIST_VALUE_LEN)*4;
   buf = tor_malloc_zero(len);
   cp = buf;