diff --git a/include/jemalloc/internal/prof_log_externs.h b/include/jemalloc/internal/prof_log_externs.h
index cde651b5..c8cc5a3e 100644
--- a/include/jemalloc/internal/prof_log_externs.h
+++ b/include/jemalloc/internal/prof_log_externs.h
@@ -3,6 +3,8 @@
 
 #include "jemalloc/internal/mutex.h"
 
+extern malloc_mutex_t log_mtx;
+
 void prof_try_log(tsd_t *tsd, size_t usize, prof_info_t *prof_info);
 bool prof_log_init(tsd_t *tsdn);
 #ifdef JEMALLOC_JET
diff --git a/src/prof.c b/src/prof.c
index 58839bc4..f35bba99 100644
--- a/src/prof.c
+++ b/src/prof.c
@@ -1119,6 +1119,7 @@ prof_prefork0(tsdn_t *tsdn) {
 		for (i = 0; i < PROF_NTDATA_LOCKS; i++) {
 			malloc_mutex_prefork(tsdn, &tdata_locks[i]);
 		}
+		malloc_mutex_prefork(tsdn, &log_mtx);
 		for (i = 0; i < PROF_NCTX_LOCKS; i++) {
 			malloc_mutex_prefork(tsdn, &gctx_locks[i]);
 		}
@@ -1150,6 +1151,7 @@ prof_postfork_parent(tsdn_t *tsdn) {
 		for (i = 0; i < PROF_NCTX_LOCKS; i++) {
 			malloc_mutex_postfork_parent(tsdn, &gctx_locks[i]);
 		}
+		malloc_mutex_postfork_parent(tsdn, &log_mtx);
 		for (i = 0; i < PROF_NTDATA_LOCKS; i++) {
 			malloc_mutex_postfork_parent(tsdn, &tdata_locks[i]);
 		}
@@ -1172,6 +1174,7 @@ prof_postfork_child(tsdn_t *tsdn) {
 		for (i = 0; i < PROF_NCTX_LOCKS; i++) {
 			malloc_mutex_postfork_child(tsdn, &gctx_locks[i]);
 		}
+		malloc_mutex_postfork_child(tsdn, &log_mtx);
 		for (i = 0; i < PROF_NTDATA_LOCKS; i++) {
 			malloc_mutex_postfork_child(tsdn, &tdata_locks[i]);
 		}
diff --git a/src/prof_log.c b/src/prof_log.c
index 6ac81e07..9411b98c 100644
--- a/src/prof_log.c
+++ b/src/prof_log.c
@@ -104,7 +104,7 @@ static prof_alloc_node_t *log_alloc_first = NULL;
 static prof_alloc_node_t *log_alloc_last = NULL;
 
 /* Protects the prof_logging_state and any log_{...} variable. */
-static malloc_mutex_t log_mtx;
+malloc_mutex_t log_mtx;
 
 /******************************************************************************/
 /*