diff --git a/cmdline/portable.h b/cmdline/portable.h
index f0f92989..feb41e55 100644
--- a/cmdline/portable.h
+++ b/cmdline/portable.h
@@ -227,6 +227,13 @@
 #include <execinfo.h>
 #endif
 
+/**
+ * Enable thread use.
+ */
+#if HAVE_PTHREAD_H && HAVE_PTHREAD_CREATE
+#define HAVE_PTHREAD 1
+#endif
+
 /**
  * Disable case check in Windows.
  */
@@ -419,7 +426,7 @@ struct devinfo_struct {
 	struct devinfo_struct* parent; /**< Pointer at the parent if any. */
 	uint64_t smart[SMART_COUNT]; /**< SMART raw attributes. */
 	char smart_serial[SMART_MAX]; /**< SMART serial number. */
-#if HAVE_PTHREAD_CREATE
+#if HAVE_PTHREAD
 	pthread_t thread;
 #endif
 	tommy_node node;
diff --git a/cmdline/snapraid.c b/cmdline/snapraid.c
index 1c79091a..7ef48888 100644
--- a/cmdline/snapraid.c
+++ b/cmdline/snapraid.c
@@ -76,7 +76,7 @@ void usage(void)
 
 void memory(void)
 {
-	log_tag("memory:used:%" PRIu64 "\n", (uint64_t)malloc_counter());
+	log_tag("memory:used:%" PRIu64 "\n", (uint64_t)malloc_counter_get());
 
 	/* size of the block */
 	log_tag("memory:block:%" PRIu64 "\n", (uint64_t)(sizeof(struct snapraid_block)));
@@ -85,7 +85,7 @@ void memory(void)
 	log_tag("memory:link:%" PRIu64 "\n", (uint64_t)(sizeof(struct snapraid_link)));
 	log_tag("memory:dir:%" PRIu64 "\n", (uint64_t)(sizeof(struct snapraid_dir)));
 
-	msg_progress("Using %u MiB of memory.\n", (unsigned)(malloc_counter() / (1024 * 1024)));
+	msg_progress("Using %u MiB of memory.\n", (unsigned)(malloc_counter_get() / (1024 * 1024)));
 }
 
 /****************************************************************************/
diff --git a/cmdline/state.c b/cmdline/state.c
index 2c2fe22c..eec04cf8 100644
--- a/cmdline/state.c
+++ b/cmdline/state.c
@@ -42,7 +42,7 @@
  * Multi thread for verify is instead always generally faster,
  * so we enable it if possible.
  */
-#if HAVE_PTHREAD_CREATE
+#if HAVE_PTHREAD
 /* #define HAVE_MT_WRITE 1 */
 #define HAVE_MT_VERIFY 1
 #endif
diff --git a/cmdline/support.c b/cmdline/support.c
index c5a17075..06d8edb2 100644
--- a/cmdline/support.c
+++ b/cmdline/support.c
@@ -607,9 +607,35 @@ int fmtime(int f, int64_t mtime_sec, int mtime_nsec)
  */
 static size_t mcounter;
 
-size_t malloc_counter(void)
+/**
+ * Mutex protection for the global memory counter.
+ */
+#if HAVE_PTHREAD
+pthread_mutex_t mcounter_mutex = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+size_t malloc_counter_get(void)
 {
-	return mcounter;
+	size_t ret;
+#if HAVE_PTHREAD
+	pthread_mutex_lock(&mcounter_mutex);
+#endif
+	ret = mcounter;
+#if HAVE_PTHREAD
+	pthread_mutex_unlock(&mcounter_mutex);
+#endif
+	return ret;
+}
+
+void malloc_counter_inc(size_t inc)
+{
+#if HAVE_PTHREAD
+	pthread_mutex_lock(&mcounter_mutex);
+#endif
+	mcounter += inc;
+#if HAVE_PTHREAD
+	pthread_mutex_unlock(&mcounter_mutex);
+#endif
 }
 
 /* LCOV_EXCL_START */
@@ -652,7 +678,7 @@ void malloc_fail(size_t size)
 	malloc_printn(f, size);
 	malloc_print(f, " bytes.\n");
 	malloc_print(f, "Already allocated ");
-	malloc_printn(f, malloc_counter());
+	malloc_printn(f, malloc_counter_get());
 	malloc_print(f, " bytes.\n");
 	if (sizeof(void*) == 4) {
 		malloc_print(f, "You are currently using a 32 bits executable.\n");
@@ -682,7 +708,7 @@ void* malloc_nofail(size_t size)
 	memset(ptr, 0xA5, size);
 #endif
 
-	mcounter += size;
+	malloc_counter_inc(size);
 
 	return ptr;
 }
@@ -705,7 +731,7 @@ void* calloc_nofail(size_t count, size_t size)
 
 	memset(ptr, 0, size);
 
-	mcounter += size;
+	malloc_counter_inc(size);
 
 	return ptr;
 }
@@ -728,7 +754,7 @@ char* strdup_nofail(const char* str)
 
 	memcpy(ptr, str, size);
 
-	mcounter += size;
+	malloc_counter_inc(size);
 
 	return ptr;
 }
diff --git a/cmdline/support.h b/cmdline/support.h
index f7b9ff20..bae27543 100644
--- a/cmdline/support.h
+++ b/cmdline/support.h
@@ -249,7 +249,7 @@ int fmtime(int f, int64_t mtime_sec, int mtime_nsec);
 /**
  * Return the size of the allocated memory.
  */
-size_t malloc_counter(void);
+size_t malloc_counter_get(void);
 
 /**
  * Safe malloc.
diff --git a/cmdline/unix.c b/cmdline/unix.c
index 743a5170..b313a97b 100644
--- a/cmdline/unix.c
+++ b/cmdline/unix.c
@@ -951,7 +951,7 @@ static int device_thread(tommy_list* list, void* (*func)(void* arg))
 	int fail = 0;
 	tommy_node* i;
 
-#if HAVE_PTHREAD_CREATE
+#if HAVE_PTHREAD
 	/* start all threads */
 	for (i = tommy_list_head(list); i != 0; i = i->next) {
 		devinfo_t* devinfo = i->data;
diff --git a/valgrind.supp b/valgrind.supp
index 014e3195..76817cc4 100644
--- a/valgrind.supp
+++ b/valgrind.supp
@@ -1,15 +1,3 @@
-{
-   Global counter of allocated memory
-   Helgrind:Race
-   fun:malloc_nofail
-}
-
-{
-   Global counter of allocated memory
-   drd:ConflictingAccess
-   fun:malloc_nofail
-}
-
 {
    printf reports false positves when printing more than one variables at time
    exp-sgcheck:SorG