diff --git a/legacy/ecore/src/lib/ecore/ecore_exe.c b/legacy/ecore/src/lib/ecore/ecore_exe.c
index 0f1f6d14da..43b6cf1cc0 100644
--- a/legacy/ecore/src/lib/ecore/ecore_exe.c
+++ b/legacy/ecore/src/lib/ecore/ecore_exe.c
@@ -1552,7 +1552,7 @@ _ecore_exe_exec_it(const char *exe_cmd, Ecore_Exe_Flags flags)
 	if (shell == NULL)
 	  {			/* Find users preferred shell. */
 	     shell = getenv("SHELL");
-	     if (shell == 0)
+	     if (shell == NULL)
 	       shell = "/bin/sh";
 	  }
 	errno = 0;
diff --git a/legacy/embryo/src/bin/embryo_cc_sc1.c b/legacy/embryo/src/bin/embryo_cc_sc1.c
index 560ae81f23..0249795eaa 100644
--- a/legacy/embryo/src/bin/embryo_cc_sc1.c
+++ b/legacy/embryo/src/bin/embryo_cc_sc1.c
@@ -1710,7 +1710,7 @@ fetchfunc(char *name, int tag)
 	 * symbol instruction.
 	 */
      }				/* if */
-   if ((sym = findglb(name)) != 0)
+   if ((sym = findglb(name)) != NULL)
      {				/* already in symbol table? */
 	if (sym->ident != iFUNCTN)
 	  {
@@ -2517,7 +2517,7 @@ declargs(symbol * sym)
 		       sym->dim.arglist =
 			  (arginfo *) realloc(sym->dim.arglist,
 					      (argcnt + 2) * sizeof(arginfo));
-		       if (sym->dim.arglist == 0)
+		       if (sym->dim.arglist == NULL)
 			  error(103);	/* insufficient memory */
 		       sym->dim.arglist[argcnt] = arg;
 		       sym->dim.arglist[argcnt + 1].ident = 0;	/* keep the list
@@ -2554,7 +2554,7 @@ declargs(symbol * sym)
 		       sym->dim.arglist =
 			  (arginfo *) realloc(sym->dim.arglist,
 					      (argcnt + 2) * sizeof(arginfo));
-		       if (sym->dim.arglist == 0)
+		       if (sym->dim.arglist == NULL)
 			  error(103);	/* insufficient memory */
 		       sym->dim.arglist[argcnt + 1].ident = 0;	/* keep the list
 								 * terminated */
diff --git a/legacy/embryo/src/bin/embryo_cc_sc3.c b/legacy/embryo/src/bin/embryo_cc_sc3.c
index e086bbf4ea..b4fe044484 100644
--- a/legacy/embryo/src/bin/embryo_cc_sc3.c
+++ b/legacy/embryo/src/bin/embryo_cc_sc3.c
@@ -1723,7 +1723,7 @@ primary(value * lval)
    if (tok == tSYMBOL && !findconst(st))
      {
 	/* first look for a local variable */
-	if ((sym = findloc(st)) != 0)
+	if ((sym = findloc(st)) != NULL)
 	  {
 	     if (sym->ident == iLABEL)
 	       {
@@ -1745,7 +1745,7 @@ primary(value * lval)
 	       }		/* if */
 	  }			/* if */
 	/* now try a global variable */
-	if ((sym = findglb(st)) != 0)
+	if ((sym = findglb(st)) != NULL)
 	  {
 	     if (sym->ident == iFUNCTN || sym->ident == iREFFUNC)
 	       {
@@ -2371,7 +2371,7 @@ constant(value * lval)
    symbol             *sym;
 
    tok = lex(&val, &st);
-   if (tok == tSYMBOL && (sym = findconst(st)) != 0)
+   if (tok == tSYMBOL && (sym = findconst(st)) != NULL)
      {
 	lval->constval = sym->addr;
 	const1(lval->constval);