diff --git a/libfreerdp/core/gcc.c b/libfreerdp/core/gcc.c
index 20a483d4f..e655342cb 100644
--- a/libfreerdp/core/gcc.c
+++ b/libfreerdp/core/gcc.c
@@ -339,8 +339,8 @@ static DWORD rdp_version_common(wLog* log, DWORD serverVersion, DWORD clientVers
  */
 static const BYTE t124_02_98_oid[6] = { 0, 0, 20, 124, 0, 1 };
 
-static const BYTE h221_cs_key[4] = "Duca";
-static const BYTE h221_sc_key[4] = "McDn";
+static const BYTE h221_cs_key[4] = { 'D', 'u', 'c', 'a' };
+static const BYTE h221_sc_key[4] = { 'M', 'c', 'D', 'n' };
 
 /**
  * Read a GCC Conference Create Request.
diff --git a/libfreerdp/core/mcs.c b/libfreerdp/core/mcs.c
index dc0a990ea..dcbbde009 100644
--- a/libfreerdp/core/mcs.c
+++ b/libfreerdp/core/mcs.c
@@ -166,8 +166,8 @@
  *
  */
 
-static const BYTE callingDomainSelector[1] = "\x01";
-static const BYTE calledDomainSelector[1] = "\x01";
+static const BYTE callingDomainSelector[1] = { 0x01 };
+static const BYTE calledDomainSelector[1] = { 0x01 };
 
 /*
 static const char* const mcs_result_enumerated[] =
diff --git a/libfreerdp/core/security.c b/libfreerdp/core/security.c
index af67bd737..cd6e26af7 100644
--- a/libfreerdp/core/security.c
+++ b/libfreerdp/core/security.c
@@ -33,19 +33,17 @@ static const BYTE BB[] = { 'B', 'B' };
 static const BYTE CCC[] = { 'C', 'C', 'C' };
 
 /* 0x36 repeated 40 times */
-static const BYTE pad1[40] = { "\x36\x36\x36\x36\x36\x36\x36\x36"
-	                           "\x36\x36\x36\x36\x36\x36\x36\x36"
-	                           "\x36\x36\x36\x36\x36\x36\x36\x36"
-	                           "\x36\x36\x36\x36\x36\x36\x36\x36"
-	                           "\x36\x36\x36\x36\x36\x36\x36\x36" };
+static const BYTE pad1[40] = { 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
+	                           0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
+	                           0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
+	                           0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36 };
 
 /* 0x5C repeated 48 times */
-static const BYTE pad2[48] = { "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C"
-	                           "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C"
-	                           "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C"
-	                           "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C"
-	                           "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C"
-	                           "\x5C\x5C\x5C\x5C\x5C\x5C\x5C\x5C" };
+static const BYTE pad2[48] = { 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
+	                           0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
+	                           0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
+	                           0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C,
+	                           0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C, 0x5C };
 
 static const BYTE fips_reverse_table[256] = {
 	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
diff --git a/libfreerdp/core/utils.c b/libfreerdp/core/utils.c
index 94074babd..78f3ca5f1 100644
--- a/libfreerdp/core/utils.c
+++ b/libfreerdp/core/utils.c
@@ -320,7 +320,7 @@ const char* utils_is_vsock(const char* hostname)
 	if (!hostname)
 		return NULL;
 
-	const char vsock[8] = "vsock://";
+	const char vsock[8] = { 'v', 's', 'o', 'c', 'k', ':', '/', '/' };
 	if (strncmp(hostname, vsock, sizeof(vsock)) == 0)
 		return &hostname[sizeof(vsock)];
 	return NULL;