diff --git a/builtin/gc.c b/builtin/gc.c
index 99431fd467..cdcf1dc6e7 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -373,8 +373,13 @@ static uint64_t total_ram(void)
 #if defined(HAVE_SYSINFO)
 	struct sysinfo si;
 
-	if (!sysinfo(&si))
-		return si.totalram;
+	if (!sysinfo(&si)) {
+		uint64_t total = si.totalram;
+
+		if (si.mem_unit > 1)
+			total *= (uint64_t)si.mem_unit;
+		return total;
+	}
 #elif defined(HAVE_BSD_SYSCTL) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM))
 	int64_t physical_memory;
 	int mib[2];