diff --git a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java
index 164ab3454..bdd3b2f4e 100644
--- a/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java
+++ b/src/main/java/com/fasterxml/jackson/databind/jsontype/impl/SubTypeValidator.java
@@ -19,7 +19,10 @@ import com.fasterxml.jackson.databind.JsonMappingException;
  */
 public class SubTypeValidator
 {
-    protected final static String PREFIX_STRING = "org.springframework.";
+    protected final static String PREFIX_SPRING = "org.springframework.";
+
+    protected final static String PREFIX_C3P0 = "com.mchange.v2.c3p0.";
+
     /**
      * Set of well-known "nasty classes", deserialization of which is considered dangerous
      * and should (and is) prevented by default.
@@ -46,8 +49,9 @@ public class SubTypeValidator
         // [databind#1737]; 3rd party
 //s.add("org.springframework.aop.support.AbstractBeanFactoryPointcutAdvisor"); // deprecated by [databind#1855]
         s.add("org.springframework.beans.factory.config.PropertyPathFactoryBean");
-        s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource");
-        s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource");
+
+// s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource"); // deprecated by [databind#1931]
+// s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"); // - "" -
         // [databind#1855]: more 3rd party
         s.add("org.apache.tomcat.dbcp.dbcp2.BasicDataSource");
         s.add("com.sun.org.apache.bcel.internal.util.ClassLoader");
@@ -86,8 +90,10 @@ public class SubTypeValidator
             // 18-Dec-2017, tatu: As per [databind#1855], need bit more sophisticated handling
             //    for some Spring framework types
             // 05-Jan-2017, tatu: ... also, only applies to classes, not interfaces
-            if (!raw.isInterface() && full.startsWith(PREFIX_STRING)) {
-                for (Class<?> cls = raw; (cls != null) && (cls != Object.class); cls = cls.getSuperclass()) {
+            if (raw.isInterface()) {
+                ;
+            } else if (full.startsWith(PREFIX_SPRING)) {
+                for (Class<?> cls = raw; (cls != null) && (cls != Object.class); cls = cls.getSuperclass()){
                     String name = cls.getSimpleName();
                     // looking for "AbstractBeanFactoryPointcutAdvisor" but no point to allow any is there?
                     if ("AbstractPointcutAdvisor".equals(name)
@@ -96,6 +102,16 @@ public class SubTypeValidator
                         break main_check;
                     }
                 }
+            } else if (full.startsWith(PREFIX_C3P0)) {
+                // [databind#1737]; more 3rd party
+                // s.add("com.mchange.v2.c3p0.JndiRefForwardingDataSource");
+                // s.add("com.mchange.v2.c3p0.WrapperConnectionPoolDataSource");
+                // [databind#1931]; more 3rd party
+                // com.mchange.v2.c3p0.ComboPooledDataSource
+                // com.mchange.v2.c3p0.debug.AfterCloseLoggingComboPooledDataSource 
+                if (full.endsWith("DataSource")) {
+                    break main_check;
+                }
             }
             return;
         } while (false);