diff --git a/services/spd/trusty/trusty.c b/services/spd/trusty/trusty.c
index ce942dd..b059a43 100644
--- a/services/spd/trusty/trusty.c
+++ b/services/spd/trusty/trusty.c
@@ -7,6 +7,7 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <string.h>
+#include <xlat_tables_v2.h>
 
 #include <arch_helpers.h>
 #include <bl31/bl31.h>
@@ -412,6 +413,14 @@
 		return -1;
 	}
 
+	/* memmap first page of trusty's code memory before peeking */
+	ret = mmap_add_dynamic_region(ep_info->pc, /* PA */
+			ep_info->pc, /* VA */
+			PAGE_SIZE, /* size */
+			MT_SECURE | MT_RW_DATA); /* attrs */
+	assert(ret == 0);
+
+	/* peek into trusty's code to see if we have a 32-bit or 64-bit image */
 	instr = *(uint32_t *)ep_info->pc;
 
 	if (instr >> 24 == 0xeaU) {
@@ -424,6 +433,9 @@
 		return -1;
 	}
 
+	/* unmap trusty's memory page */
+	(void)mmap_remove_dynamic_region(ep_info->pc, PAGE_SIZE);
+
 	SET_PARAM_HEAD(ep_info, PARAM_EP, VERSION_1, SECURE | EP_ST_ENABLE);
 	if (!aarch32)
 		ep_info->spsr = SPSR_64(MODE_EL1, MODE_SP_ELX,