diff --git a/xpcom/reflect/xptinfo/src/nsInterfaceInfoManager.cpp b/xpcom/reflect/xptinfo/src/nsInterfaceInfoManager.cpp
index 995b44a8c183..ef5d2d9f61ad 100644
--- a/xpcom/reflect/xptinfo/src/nsInterfaceInfoManager.cpp
+++ b/xpcom/reflect/xptinfo/src/nsInterfaceInfoManager.cpp
@@ -138,7 +138,7 @@ XPTHeader *getHeader(const char *filename, nsIAllocator *al) {
     }
 
     if (flen > 0) {
-       	PRUint32 howmany = PR_Read(in, whole, flen);
+       	PRInt32 howmany = PR_Read(in, whole, flen);
        	if (howmany < 0) {
            	NS_ERROR("FAILED: reading typelib file");
            	goto out;
diff --git a/xpcom/typelib/xpt/tools/xpt_dump.c b/xpcom/typelib/xpt/tools/xpt_dump.c
index 6749de77d825..d0476416e45c 100644
--- a/xpcom/typelib/xpt/tools/xpt_dump.c
+++ b/xpcom/typelib/xpt/tools/xpt_dump.c
@@ -214,10 +214,6 @@ main(int argc, char **argv)
 
     if (flen > 0) {
         size_t rv = fread(whole, 1, flen, in);
-        if (rv < 0) {
-            perror("FAILED: reading typelib file");
-            return 1;
-        }
         if (rv < flen) {
             fprintf(stderr, "short read (%d vs %d)! ouch!\n", rv, flen);
             return 1;
diff --git a/xpcom/typelib/xpt/tools/xpt_link.c b/xpcom/typelib/xpt/tools/xpt_link.c
index 08c2f8582522..3c78668df727 100644
--- a/xpcom/typelib/xpt/tools/xpt_link.c
+++ b/xpcom/typelib/xpt/tools/xpt_link.c
@@ -145,10 +145,6 @@ main(int argc, char **argv)
         
         if (flen > 0) {
             size_t rv = fread(whole, 1, flen, in);
-            if (rv < 0) {
-                perror("FAILED: reading typelib file");
-                return 1;
-            }
             if (rv < flen) {
                 fprintf(stderr, "short read (%d vs %d)! ouch!\n", rv, flen);
                 return 1;