diff --git a/libc/bionic/jemalloc_wrapper.cpp b/libc/bionic/jemalloc_wrapper.cpp
index a2bb1db..1bbdb29 100644
--- a/libc/bionic/jemalloc_wrapper.cpp
+++ b/libc/bionic/jemalloc_wrapper.cpp
@@ -77,9 +77,13 @@
 int je_mallopt(int param, int value) {
   // The only parameter we currently understand is M_DECAY_TIME.
   if (param == M_DECAY_TIME) {
-    // Only support setting the value to 1 or 0.
+    // Only support setting the value to -1 or 0 or 1.
     ssize_t decay_time_ms;
-    if (value) {
+    if (value < 0) {
+      // Given that SSIZE_MAX may not be supported in jemalloc, set this to a
+      // sufficiently large number that essentially disables the decay timer.
+      decay_time_ms = 10000000;
+    } else if (value) {
       decay_time_ms = 1000;
     } else {
       decay_time_ms = 0;
diff --git a/libc/bionic/malloc_common.cpp b/libc/bionic/malloc_common.cpp
index 9932e3e..596a1fc 100644
--- a/libc/bionic/malloc_common.cpp
+++ b/libc/bionic/malloc_common.cpp
@@ -123,7 +123,7 @@
   // Track the M_DECAY_TIME mallopt calls.
   if (param == M_DECAY_TIME && retval == 1) {
     __libc_globals.mutate([value](libc_globals* globals) {
-      if (value == 0) {
+      if (value <= 0) {
         atomic_store(&globals->decay_time_enabled, false);
       } else {
         atomic_store(&globals->decay_time_enabled, true);