diff --git a/src/content/content-manager.cpp b/src/content/content-manager.cpp
index ff341bcf2..6040140b8 100644
--- a/src/content/content-manager.cpp
+++ b/src/content/content-manager.cpp
@@ -30,7 +30,7 @@
 // =============================================================================
 
 namespace {
-	constexpr const char MultipartBoundary[] = "---------------------------14737809831466499882746641449";
+	constexpr char MultipartBoundary[] = "---------------------------14737809831466499882746641449";
 }
 
 using namespace std;
diff --git a/src/sip-tools/sip-headers.h b/src/sip-tools/sip-headers.h
index 969735841..788fec285 100644
--- a/src/sip-tools/sip-headers.h
+++ b/src/sip-tools/sip-headers.h
@@ -29,13 +29,13 @@ using namespace std;
 LINPHONE_BEGIN_NAMESPACE
 
 namespace PriorityHeader {
-	constexpr const char HeaderName[] = "Priority";
+	constexpr char HeaderName[] = "Priority";
 
 	// Values
-	constexpr const char NonUrgent[] = "non-urgent";
-	constexpr const char Urgent[] = "urgent";
-	constexpr const char Emergency[] = "emergency";
-	constexpr const char Normal[] = "normal";
+	constexpr char NonUrgent[] = "non-urgent";
+	constexpr char Urgent[] = "urgent";
+	constexpr char Emergency[] = "emergency";
+	constexpr char Normal[] = "normal";
 }
 
 LINPHONE_END_NAMESPACE