diff --git a/ChangeLog b/ChangeLog
index 996a1a1..48d423b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -43,6 +43,8 @@ the minimum.
 
 11. Added PCRE2_SUBSTITUTE_REPLACEMENT_ONLY.
 
+12. The JIT stack should be freed when the low-level stack allocation fails.
+
 
 Version 10.34 21-November-2019
 ------------------------------
diff --git a/src/pcre2_jit_misc.c b/src/pcre2_jit_misc.c
index efdb055..36abdba 100644
--- a/src/pcre2_jit_misc.c
+++ b/src/pcre2_jit_misc.c
@@ -145,6 +145,11 @@ maxsize = (maxsize + STACK_GROWTH_RATE - 1) & ~(STACK_GROWTH_RATE - 1);
 jit_stack = PRIV(memctl_malloc)(sizeof(pcre2_real_jit_stack), (pcre2_memctl *)gcontext);
 if (jit_stack == NULL) return NULL;
 jit_stack->stack = sljit_allocate_stack(startsize, maxsize, &jit_stack->memctl);
+if (jit_stack->stack == NULL)
+  {
+  jit_stack->memctl.free(jit_stack, jit_stack->memctl.memory_data);
+  return NULL;
+  }
 return jit_stack;
 
 #endif