diff --git a/src/AGRegex/AGRegex.m b/src/AGRegex/AGRegex.m
index fffd893..d38c029 100644
--- a/src/AGRegex/AGRegex.m
+++ b/src/AGRegex/AGRegex.m
@@ -333,7 +333,7 @@ - (NSArray *)splitString:(NSString *)str limit:(int)lim {
 		// add captured subpatterns if any
 		count = [match count];
 		for (j = 1; j < count; j++)
-			if (group = [match groupAtIndex:j])
+			if ((group = [match groupAtIndex:j]))
 				[result addObject:group];
 		// set remaining range to the part after the split
 		remainRange.location = matchRange.location + matchRange.length;
@@ -447,7 +447,7 @@ - (void)dealloc {
 
 - (id)nextObject {
     AGRegexMatch *next;
-    if (next = [regex findInString:string range:range]) {
+    if ((next = [regex findInString:string range:range])) {
         range.location = [next range].location + [next range].length;
         if ([next range].length == 0)
             range.location++;
diff --git a/src/ComplexType.m b/src/ComplexType.m
index b41ef45..e9e78dd 100644
--- a/src/ComplexType.m
+++ b/src/ComplexType.m
@@ -225,7 +225,7 @@ - (void)setPropOrder:(NSArray *)newOrder;
 {
 	if (newOrder != propOrder) {
 		[propOrder autorelease];
-		propOrder = [newOrder retain];
+		propOrder = (NSMutableArray *)[newOrder retain];
 	}
 }
 
diff --git a/src/WSDLParsingServiceLibxsltImpl.m b/src/WSDLParsingServiceLibxsltImpl.m
index cd6b4d2..e1966be 100644
--- a/src/WSDLParsingServiceLibxsltImpl.m
+++ b/src/WSDLParsingServiceLibxsltImpl.m
@@ -318,7 +318,7 @@ - (void)setErrorMessage:(NSString *)newMsg;
 {
 	if (newMsg != errorMessage) {
 		[errorMessage autorelease];
-		errorMessage = [newMsg retain];
+		errorMessage = (NSMutableString *)[newMsg retain];
 	}
 }