diff --git a/lib/el3_runtime/aarch32/context_mgmt.c b/lib/el3_runtime/aarch32/context_mgmt.c
index 11ef6e5..80cea28 100644
--- a/lib/el3_runtime/aarch32/context_mgmt.c
+++ b/lib/el3_runtime/aarch32/context_mgmt.c
@@ -14,6 +14,7 @@
 #include <platform.h>
 #include <platform_def.h>
 #include <smccc_helpers.h>
+#include <stdbool.h>
 #include <string.h>
 #include <utils.h>
 
@@ -129,7 +130,7 @@
  * When EL2 is implemented but unused `el2_unused` is non-zero, otherwise
  * it is zero.
  ******************************************************************************/
-static void enable_extensions_nonsecure(int el2_unused)
+static void enable_extensions_nonsecure(bool el2_unused)
 {
 #if IMAGE_BL32
 #if ENABLE_AMU
@@ -175,7 +176,7 @@
 {
 	uint32_t hsctlr, scr;
 	cpu_context_t *ctx = cm_get_context(security_state);
-	int el2_unused = 0;
+	bool el2_unused = false;
 
 	assert(ctx);
 
@@ -200,7 +201,7 @@
 			isb();
 		} else if (read_id_pfr1() &
 			(ID_PFR1_VIRTEXT_MASK << ID_PFR1_VIRTEXT_SHIFT)) {
-			el2_unused = 1;
+			el2_unused = true;
 
 			/*
 			 * Set the NS bit to access NS copies of certain banked
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index d3984a2..f037e18 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -18,6 +18,7 @@
 #include <pubsub_events.h>
 #include <smccc_helpers.h>
 #include <spe.h>
+#include <stdbool.h>
 #include <string.h>
 #include <sve.h>
 #include <utils.h>
@@ -231,7 +232,7 @@
  * When EL2 is implemented but unused `el2_unused` is non-zero, otherwise
  * it is zero.
  ******************************************************************************/
-static void enable_extensions_nonsecure(int el2_unused)
+static void enable_extensions_nonsecure(bool el2_unused)
 {
 #if IMAGE_BL31
 #if ENABLE_SPE_FOR_LOWER_ELS
@@ -289,7 +290,7 @@
 {
 	uint32_t sctlr_elx, scr_el3, mdcr_el2;
 	cpu_context_t *ctx = cm_get_context(security_state);
-	int el2_unused = 0;
+	bool el2_unused = false;
 	uint64_t hcr_el2 = 0;
 
 	assert(ctx);
@@ -304,7 +305,7 @@
 			sctlr_elx |= SCTLR_EL2_RES1;
 			write_sctlr_el2(sctlr_elx);
 		} else if (EL_IMPLEMENTED(2)) {
-			el2_unused = 1;
+			el2_unused = true;
 
 			/*
 			 * EL2 present but unused, need to disable safely.