diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index 54536ff86..a5c134196 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -221,6 +221,7 @@ enum tainted_flags {
 	TAINTED_BUG                    = 0x00000020, /* a BUG_ON triggered */
 	TAINTED_SHARED_LIBS            = 0x00000040, /* a shared library was loaded */
 	TAINTED_REDEFINITION           = 0x00000080, /* symbol redefinition detected */
+	TAINTED_REPLACED_MEM_ALLOCATOR = 0x00000100, /* memory allocator was replaced using LD_PRELOAD */
 };
 
 /* this is a bit field made of TAINTED_*, and is declared in haproxy.c */
diff --git a/include/haproxy/pool.h b/include/haproxy/pool.h
index d034feaff..19ead2379 100644
--- a/include/haproxy/pool.h
+++ b/include/haproxy/pool.h
@@ -101,7 +101,6 @@ extern int mem_poison_byte;
 /* set of POOL_DBG_* flags */
 extern uint pool_debugging;
 
-int is_trim_enabled(void);
 int malloc_trim(size_t pad);
 void trim_all_pools(void);
 
diff --git a/src/pool.c b/src/pool.c
index 07b122a61..292b27d13 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -188,11 +188,6 @@ static void detect_allocator(void)
 	_malloc_trim = get_sym_next_addr("malloc_trim");
 }
 
-int is_trim_enabled(void)
-{
-	return !disable_trim && using_default_allocator;
-}
-
 /* replace the libc's malloc_trim() so that we can also intercept the calls
  * from child libraries when the allocator is not the default one.
  */
@@ -1221,10 +1216,11 @@ INITCALL0(STG_PREPARE, init_pools);
 /* Report in build options if trim is supported */
 static void pools_register_build_options(void)
 {
-	if (is_trim_enabled() && _malloc_trim) {
+	if (!using_default_allocator) {
 		char *ptr = NULL;
-		memprintf(&ptr, "Support for malloc_trim() is enabled.");
+		memprintf(&ptr, "Running with a replaced memory allocator (e.g. via LD_PRELOAD).");
 		hap_register_build_opts(ptr, 1);
+		mark_tainted(TAINTED_REPLACED_MEM_ALLOCATOR);
 	}
 }
 INITCALL0(STG_REGISTER, pools_register_build_options);