diff --git a/frontend/src/main.c b/frontend/src/main.c
index 963ba02..8e30ec2 100644
--- a/frontend/src/main.c
+++ b/frontend/src/main.c
@@ -49,10 +49,10 @@ static int weak_passphrase(const CHR *str)
 	while (*str)
 	{
 		const CHR c = *str++;
-		if      (iswupper(c)) flags[0U] = 1;
-		else if (iswlower(c)) flags[1U] = 1;
-		else if (iswdigit(c)) flags[2U] = 1;
-		else if (iswgraph(c)) flags[3U] = 1;
+		if      (ISUPPER(c)) flags[0U] = 1;
+		else if (ISLOWER(c)) flags[1U] = 1;
+		else if (ISDIGIT(c)) flags[2U] = 1;
+		else if (ISGRAPH(c)) flags[3U] = 1;
 	}
 	const int strong = flags[0U] && flags[1U] && flags[2U] && flags[3U];
 	return !strong;
@@ -66,11 +66,11 @@ static int encrypt(const CHR* const passphrase, const CHR* const input, const CH
 
 	if (STRLEN(passphrase) < 8U)
 	{
-		FPUTS(L"Warning: Using a short passphrase. Eight characters or more are recommended!\n\n", stderr);
+		FPUTS(T("Warning: Using a short passphrase. Eight characters or more are recommended!\n\n"), stderr);
 	}
 	else if (weak_passphrase(passphrase))
 	{
-		FPUTS(L"Warning: Using a weak passphrase. A mix of upper-case characters, lower-case characters, digits and 'special' characters is recommended!\n\n", stderr);
+		FPUTS(T("Warning: Using a weak passphrase. A mix of upper-case characters, lower-case characters, digits and 'special' characters is recommended!\n\n"), stderr);
 	}
 
 	char *const passphrase_utf8 = utf16_to_bytes(passphrase, CP_UTF8);
@@ -354,8 +354,8 @@ int MAIN(int argc, CHR* argv[])
 			FPUTS(T("Nothing to do!\n\n"), stderr);
 		}
 		FPUTS(T("Usage:\n"), stderr);
-		FPRINTF(stderr, T("  %") T(PRIwcs) T(" --encrypt <passphrase> <input.txt> <output.enc>\n"),   argv[0U]);
-		FPRINTF(stderr, T("  %") T(PRIwcs) T(" --decrypt <passphrase> <input.enc> <output.txt>\n\n"), argv[0U]);
+		FPRINTF(stderr, T("  %") T(PRISTR) T(" --encrypt <passphrase> <input.txt> <output.enc>\n"),   argv[0U]);
+		FPRINTF(stderr, T("  %") T(PRISTR) T(" --decrypt <passphrase> <input.enc> <output.txt>\n\n"), argv[0U]);
 		return 1;
 	}
 
@@ -378,7 +378,7 @@ int MAIN(int argc, CHR* argv[])
 	}
 	else
 	{
-		FPRINTF(stderr, T("Error: Command \"%") T(PRIwcs) T("\" is unknown!\n\n"), argv[1U]);
+		FPRINTF(stderr, T("Error: Command \"%") T(PRISTR) T("\" is unknown!\n\n"), argv[1U]);
 		erase(argv[2U], STRLEN(argv[2U]) * sizeof(CHR));
 		return 1;
 	}
diff --git a/frontend/src/platform.h b/frontend/src/platform.h
index fe8efd2..b41a172 100644
--- a/frontend/src/platform.h
+++ b/frontend/src/platform.h
@@ -18,10 +18,16 @@
 #define FILENO(X) _fileno((X))
 #define FSTAT64(X,Y) _fstati64((X),(Y))
 #define STAT64_T struct _stati64
+#define ISUPPER(X) iswupper((X))
+#define ISLOWER(X) iswlower((X))
+#define ISDIGIT(X) iswdigit((X))
+#define ISGRAPH(X) iswgraph((X))
 #ifdef __MINGW32__
+#define PRISTR "ls"
 #define PRIstr "hs"
 #define PRIwcs "ls"
 #else
+#define PRISTR "s"
 #define PRIstr "S"
 #define PRIwcs "s"
 #endif
@@ -37,6 +43,11 @@
 #define FILENO(X) fileno((X))
 #define FSTAT64(X,Y) fstat64((X),(Y))
 #define STAT64_T struct stat64
+#define ISUPPER(X) isupper((X))
+#define ISLOWER(X) islower((X))
+#define ISDIGIT(X) isdigit((X))
+#define ISGRAPH(X) isgraph((X))
+#define PRISTR "s"
 #define PRIstr "s"
 #define PRIwcs "ls"
 #endif