diff --git a/doc/man/txt/xz.txt b/doc/man/txt/xz.txt
index e3dacde..c533540 100644
--- a/doc/man/txt/xz.txt
+++ b/doc/man/txt/xz.txt
@@ -91,7 +91,7 @@ DESCRIPTION
        case memory usage of the decompressor is several gigabytes.
 
        To  prevent uncomfortable surprises caused by huge memory usage, xz has
-       a built-in memory usage limiter. The default limit is  40  %  of  total
+       a built-in memory usage limiter. The default limit is 100  %  of  total
        physical  RAM. While operating systems provide ways to limit the memory
        usage of processes, relying on it wasn't deemed to be flexible enough.
 
@@ -362,7 +362,7 @@ OPTIONS
                  Example: --memory=70%
 
               o  The limit can be reset back to its default  value  (currently
-                 40 % of physical RAM) by setting it to 0.
+                 100% of physical RAM) by setting it to 0.
 
               o  The memory usage limiting can be effectively disabled by set-
                  ting limit to max.  This isn't recommended. It's usually bet-
diff --git a/doc/man/txt/xzdec.txt b/doc/man/txt/xzdec.txt
index ee2b820..7018399 100644
--- a/doc/man/txt/xzdec.txt
+++ b/doc/man/txt/xzdec.txt
@@ -49,7 +49,7 @@ OPTIONS
                  Example: --memory=70%
 
               o  The limit can be reset back to its default  value  (currently
-                 40 % of physical RAM) by setting it to 0.
+                 100% of physical RAM) by setting it to 0.
 
               o  The memory usage limiting can be effectively disabled by set-
                  ting limit to max.  This isn't recommended. It's usually bet-
diff --git a/src/xz/hardware.c b/src/xz/hardware.c
index 72dc2cb..7b7265b 100644
--- a/src/xz/hardware.c
+++ b/src/xz/hardware.c
@@ -51,7 +51,7 @@ hardware_memlimit_set(uint64_t new_memlimit)
 {
 	if (new_memlimit == 0) {
 		// The default is 40 % of total installed physical RAM.
-		hardware_memlimit_set_percentage(40);
+		hardware_memlimit_set_percentage(100);
 	} else {
 		memlimit = new_memlimit;
 	}
diff --git a/src/xzdec/xzdec.c b/src/xzdec/xzdec.c
index e99934f..3ebdef2 100644
--- a/src/xzdec/xzdec.c
+++ b/src/xzdec/xzdec.c
@@ -145,7 +145,7 @@ static void
 memlimit_set(uint64_t new_memlimit)
 {
 	if (new_memlimit == 0)
-		memlimit_set_percentage(40);
+		memlimit_set_percentage(100);
 	else
 		memlimit = new_memlimit;