diff --git a/lib/db/dbmi_base/alloc.c b/lib/db/dbmi_base/alloc.c
index 032d6074b64..635138b18df 100644
--- a/lib/db/dbmi_base/alloc.c
+++ b/lib/db/dbmi_base/alloc.c
@@ -27,7 +27,7 @@ char *db_store(const char *s)
 {
     char *a;
 
-    a = db_malloc(strlen(s) + 1);
+    a = db_malloc((int)strlen(s) + 1);
     if (a)
         strcpy(a, s);
     return a;
diff --git a/lib/db/dbmi_base/dirent.c b/lib/db/dbmi_base/dirent.c
index 5c33a1f6ea9..73a4b7d6c68 100644
--- a/lib/db/dbmi_base/dirent.c
+++ b/lib/db/dbmi_base/dirent.c
@@ -69,14 +69,14 @@ dbDirent *db_dirent(const char *dirname, int *n)
     max = 0;
     while ((entry = readdir(dp))) {
         count++;
-        len = strlen(entry->d_name);
+        len = (int)strlen(entry->d_name);
         if (len > max)
             max = len;
     }
     rewinddir(dp);
 
     size_t path_len = strlen(dirname) + max + 2; // extra 2 for / and NULL
-    path = db_malloc(path_len);
+    path = db_malloc((int)path_len);
     if (path == NULL) {
         closedir(dp);
         return (dbDirent *)NULL;
diff --git a/lib/db/dbmi_base/string.c b/lib/db/dbmi_base/string.c
index c6e19e0b313..fbfeddc06b5 100644
--- a/lib/db/dbmi_base/string.c
+++ b/lib/db/dbmi_base/string.c
@@ -90,7 +90,7 @@ static int set_string(dbString *x, char *s, int copy)
         copy = 1;
     }
 
-    len = strlen(s) + 1;
+    len = (int)strlen(s) + 1;
 
     if (copy) {
         stat = db_enlarge_string(x, len);
@@ -202,14 +202,14 @@ dbString *db_alloc_string_array(int count)
  */
 int db_append_string(dbString *x, const char *s)
 {
-    int len;
+    size_t len;
     int stat;
 
     if (!db_get_string(x))
         return db_set_string(x, s);
 
     len = strlen(db_get_string(x)) + strlen(s) + 1;
-    stat = db_enlarge_string(x, len);
+    stat = db_enlarge_string(x, (int)len);
     if (stat != DB_OK)
         return stat;
     strcat(db_get_string(x), s);
diff --git a/lib/db/dbmi_base/xdrstring.c b/lib/db/dbmi_base/xdrstring.c
index e46cd6bbc8c..f476d6e2cf6 100644
--- a/lib/db/dbmi_base/xdrstring.c
+++ b/lib/db/dbmi_base/xdrstring.c
@@ -85,7 +85,7 @@ int db__send_string(dbString *x)
 {
     int stat = DB_OK;
     const char *s = db_get_string(x);
-    int len = s ? strlen(s) + 1 : 1;
+    int len = s ? (int)strlen(s) + 1 : 1;
 
     if (!s)
         s = ""; /* don't send a NULL string */