diff --git a/cstdlib/stdio.c b/cstdlib/stdio.c
index 7915599..86f8705 100644
--- a/cstdlib/stdio.c
+++ b/cstdlib/stdio.c
@@ -396,17 +396,17 @@ void StdioTmpfile(struct ParseState *Parser, struct Value *ReturnValue, struct V
 
 void StdioClearerr(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
 {
-    clearerr(Param[0]->Val->Pointer);
+    clearerr((FILE *)Param[0]->Val->Pointer);
 }
 
 void StdioFeof(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
 {
-    ReturnValue->Val->Integer = feof(Param[0]->Val->Pointer);
+    ReturnValue->Val->Integer = feof((FILE *)Param[0]->Val->Pointer);
 }
 
 void StdioFerror(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
 {
-    ReturnValue->Val->Integer = ferror(Param[0]->Val->Pointer);
+    ReturnValue->Val->Integer = ferror((FILE *)Param[0]->Val->Pointer);
 }
 
 void StdioFileno(struct ParseState *Parser, struct Value *ReturnValue, struct Value **Param, int NumArgs) 
diff --git a/lex.c b/lex.c
index 8314f21..6a81a6e 100644
--- a/lex.c
+++ b/lex.c
@@ -205,7 +205,7 @@ enum LexToken LexGetWord(struct LexState *Lexer, struct Value *Value)
     
     do {
         LEXER_INC(Lexer);
-    } while (Lexer->Pos != Lexer->End && isCident(*Lexer->Pos));
+    } while (Lexer->Pos != Lexer->End && isCident((int)*Lexer->Pos));
     
     Value->Typ = NULL;
     Value->Val->Identifier = TableStrRegister2(StartPos, Lexer->Pos - StartPos);
@@ -367,7 +367,7 @@ enum LexToken LexScanGetToken(struct LexState *Lexer, struct Value **Value)
     do
     {
         *Value = &LexValue;
-        while (Lexer->Pos != Lexer->End && isspace(*Lexer->Pos))
+        while (Lexer->Pos != Lexer->End && isspace((int)*Lexer->Pos))
         {
             if (*Lexer->Pos == '\n')
             {
@@ -387,10 +387,10 @@ enum LexToken LexScanGetToken(struct LexState *Lexer, struct Value **Value)
             return TokenEOF;
         
         ThisChar = *Lexer->Pos;
-        if (isCidstart(ThisChar))
+        if (isCidstart((int)ThisChar))
             return LexGetWord(Lexer, *Value);
         
-        if (isdigit(ThisChar))
+        if (isdigit((int)ThisChar))
             return LexGetNumber(Lexer, *Value);
         
         NextChar = (Lexer->Pos+1 != Lexer->End) ? *(Lexer->Pos+1) : 0;
diff --git a/tests/28_strings.c b/tests/28_strings.c
index 24e80bd..862800e 100644
--- a/tests/28_strings.c
+++ b/tests/28_strings.c
@@ -9,9 +9,9 @@ printf("%s\n", a);
 strncpy(a, "gosh", 2);
 printf("%s\n", a);
 
-printf("%d\n", strcmp(a, "apple"));
-printf("%d\n", strcmp(a, "goere"));
-printf("%d\n", strcmp(a, "zebra"));
+printf("%d\n", strcmp(a, "apple") > 0);
+printf("%d\n", strcmp(a, "goere") > 0);
+printf("%d\n", strcmp(a, "zebra") < 0);
 
 printf("%d\n", strlen(a));
 
@@ -33,7 +33,7 @@ printf("%s\n", a);
 memcpy(&a[2], a, 2);
 printf("%s\n", a);
 
-printf("%d\n", memcmp(a, "apple", 4));
-printf("%d\n", memcmp(a, "grgr", 4));
-printf("%d\n", memcmp(a, "zebra", 4));
+printf("%d\n", memcmp(a, "apple", 4) > 0);
+printf("%d\n", memcmp(a, "grgr", 4) == 0);
+printf("%d\n", memcmp(a, "zebra", 4) < 0);
 
diff --git a/tests/28_strings.expect b/tests/28_strings.expect
index d016865..fd9217a 100644
--- a/tests/28_strings.expect
+++ b/tests/28_strings.expect
@@ -2,7 +2,7 @@ hello
 gollo
 1
 1
--1
+1
 5
 gollo!
 1
@@ -15,5 +15,5 @@ lo!
 grrrr!
 grgrr!
 1
-0
--1
+1
+1