diff --git a/lib/isc/mem.c b/lib/isc/mem.c
index 61a66f6087..6560833752 100644
--- a/lib/isc/mem.c
+++ b/lib/isc/mem.c
@@ -1906,3 +1906,14 @@ isc__mem_printactive(isc_mem_t *ctx, FILE *file) {
 	UNUSED(file);
 #endif /* if ISC_MEM_TRACKLINES */
 }
+
+void *
+isc__mem_alloc_noctx(size_t size) {
+	return mallocx(size, 0);
+}
+
+void
+isc__mem_free_noctx(void *ptr, size_t size) {
+	ADJUST_ZERO_ALLOCATION_SIZE(size);
+	sdallocx(ptr, size, 0);
+}
diff --git a/lib/isc/mem_p.h b/lib/isc/mem_p.h
index 611a025a14..d95bfc3f06 100644
--- a/lib/isc/mem_p.h
+++ b/lib/isc/mem_p.h
@@ -26,6 +26,17 @@ isc__mem_printactive(isc_mem_t *mctx, FILE *file);
  * a single memory context.
  */
 
+void *
+isc__mem_alloc_noctx(size_t size);
+void
+isc__mem_free_noctx(void *ptr, size_t size);
+/*%<
+ * Allocate memory that is not associated with an isc_mem memory context.
+ *
+ * For use purely in the isc_trampoline unit, to avoid the need of copying
+ * multiple #ifdef lines from lib/isc/mem.c to lib/isc/trampoline.c.
+ */
+
 void
 isc__mem_checkdestroyed(void);
 
diff --git a/lib/isc/trampoline.c b/lib/isc/trampoline.c
index 58171d9138..3e58fa7032 100644
--- a/lib/isc/trampoline.c
+++ b/lib/isc/trampoline.c
@@ -22,6 +22,7 @@
 #include <isc/thread.h>
 #include <isc/util.h>
 
+#include "mem_p.h"
 #include "trampoline_p.h"
 
 #define ISC__TRAMPOLINE_UNUSED 0
@@ -148,7 +149,7 @@ isc__trampoline_detach(isc__trampoline_t *trampoline) {
 		isc__trampoline_min = trampoline->tid;
 	}
 
-	free(trampoline->jemalloc_enforce_init);
+	isc__mem_free_noctx(trampoline->jemalloc_enforce_init, 8);
 	free(trampoline);
 
 	uv_mutex_unlock(&isc__trampoline_lock);
@@ -174,7 +175,7 @@ isc__trampoline_attach(isc__trampoline_t *trampoline) {
 	 * so that an optimizing compiler does not strip away such a pair of
 	 * malloc() + free() calls altogether, as it would foil the fix.
 	 */
-	trampoline->jemalloc_enforce_init = malloc(8);
+	trampoline->jemalloc_enforce_init = isc__mem_alloc_noctx(8);
 	uv_mutex_unlock(&isc__trampoline_lock);
 }