diff --git a/lib/pmf/pmf_main.c b/lib/pmf/pmf_main.c
index a020860..25513c1 100644
--- a/lib/pmf/pmf_main.c
+++ b/lib/pmf/pmf_main.c
@@ -25,9 +25,10 @@
 
 IMPORT_SYM(uintptr_t, __PMF_SVC_DESCS_START__,		PMF_SVC_DESCS_START);
 IMPORT_SYM(uintptr_t, __PMF_SVC_DESCS_END__,		PMF_SVC_DESCS_END);
-IMPORT_SYM(uintptr_t, __PERCPU_TIMESTAMP_SIZE__,	PMF_PERCPU_TIMESTAMP_SIZE);
+IMPORT_SYM(uintptr_t, __PMF_PERCPU_TIMESTAMP_END__,	PMF_PERCPU_TIMESTAMP_END);
 IMPORT_SYM(intptr_t,  __PMF_TIMESTAMP_START__,		PMF_TIMESTAMP_ARRAY_START);
-IMPORT_SYM(uintptr_t, __PMF_TIMESTAMP_END__,		PMF_TIMESTAMP_ARRAY_END);
+
+#define PMF_PERCPU_TIMESTAMP_SIZE	(PMF_PERCPU_TIMESTAMP_END - PMF_TIMESTAMP_ARRAY_START)
 
 #define PMF_SVC_DESCS_MAX		10