diff --git a/include/lib/extensions/brbe.h b/include/lib/extensions/brbe.h
index aee208d..9ee2444 100644
--- a/include/lib/extensions/brbe.h
+++ b/include/lib/extensions/brbe.h
@@ -10,7 +10,7 @@
 #if ENABLE_BRBE_FOR_NS
 void brbe_enable(void);
 #else
-void brbe_enable(void)
+static inline void brbe_enable(void)
 {
 }
 #endif /* ENABLE_BRBE_FOR_NS */
diff --git a/include/lib/extensions/mpam.h b/include/lib/extensions/mpam.h
index 120a921..4327278 100644
--- a/include/lib/extensions/mpam.h
+++ b/include/lib/extensions/mpam.h
@@ -12,7 +12,7 @@
 #if ENABLE_MPAM_FOR_LOWER_ELS
 void mpam_enable(bool el2_unused);
 #else
-void mpam_enable(bool el2_unused)
+static inline void mpam_enable(bool el2_unused)
 {
 }
 #endif
diff --git a/include/lib/extensions/spe.h b/include/lib/extensions/spe.h
index d443f18..02fccae 100644
--- a/include/lib/extensions/spe.h
+++ b/include/lib/extensions/spe.h
@@ -13,10 +13,10 @@
 void spe_enable(bool el2_unused);
 void spe_disable(void);
 #else
-void spe_enable(bool el2_unused)
+static inline void spe_enable(bool el2_unused)
 {
 }
-void spe_disable(void)
+static inline void spe_disable(void)
 {
 }
 #endif
diff --git a/include/lib/extensions/trbe.h b/include/lib/extensions/trbe.h
index 0eff7c4..861a4ad 100644
--- a/include/lib/extensions/trbe.h
+++ b/include/lib/extensions/trbe.h
@@ -10,7 +10,7 @@
 #if ENABLE_TRBE_FOR_NS
 void trbe_enable(void);
 #else
-void trbe_enable(void)
+static inline void trbe_enable(void)
 {
 }
 #endif /* ENABLE_TRBE_FOR_NS */
diff --git a/include/lib/extensions/trf.h b/include/lib/extensions/trf.h
index a440abd..91a9615 100644
--- a/include/lib/extensions/trf.h
+++ b/include/lib/extensions/trf.h
@@ -10,7 +10,7 @@
 #if ENABLE_TRF_FOR_NS
 void trf_enable(void);
 #else
-void trf_enable(void)
+static inline void trf_enable(void)
 {
 }
 #endif /* ENABLE_TRF_FOR_NS */