diff --git a/pmap.c b/pmap.c
index 4fb7a61c..742fcea9 100644
--- a/pmap.c
+++ b/pmap.c
@@ -661,7 +661,7 @@ int main(int argc, char **argv)
 	    x_option && (d_option || X_option))
 		xerrx(EXIT_FAILURE, _("options -d, -x, -X are mutually exclusive"));
 
-	pidlist = xmalloc(sizeof(unsigned) * argc);
+	pidlist = xmalloc(sizeof(unsigned long) * argc);
 
 	while (*argv) {
 		char *walk = *argv++;
diff --git a/proc/alloc.c b/proc/alloc.c
index 671d7523..94af47f7 100644
--- a/proc/alloc.c
+++ b/proc/alloc.c
@@ -50,14 +50,14 @@ void *xcalloc(unsigned int size) {
     return p;
 }
 
-void *xmalloc(unsigned int size) {
+void *xmalloc(size_t size) {
     void *p;
 
     if (size == 0)
         ++size;
     p = malloc(size);
     if (!p) {
-        xalloc_err_handler("%s failed to allocate %u bytes of memory", __func__, size);
+	xalloc_err_handler("%s failed to allocate %zu bytes of memory", __func__, size);
         exit(EXIT_FAILURE);
     }
     return(p);
diff --git a/proc/alloc.h b/proc/alloc.h
index 82b53592..19c91d78 100644
--- a/proc/alloc.h
+++ b/proc/alloc.h
@@ -9,7 +9,7 @@ EXTERN_C_BEGIN
 extern message_fn xalloc_err_handler;
 
 extern void *xcalloc(unsigned int size) MALLOC;
-extern void *xmalloc(unsigned int size) MALLOC;
+extern void *xmalloc(size_t size) MALLOC;
 extern void *xrealloc(void *oldp, unsigned int size) MALLOC;
 extern char *xstrdup(const char *str) MALLOC;