diff --git a/bindings/java/unicorn/Unicorn.java b/bindings/java/unicorn/Unicorn.java
index 985a322d..9117a65f 100644
--- a/bindings/java/unicorn/Unicorn.java
+++ b/bindings/java/unicorn/Unicorn.java
@@ -25,12 +25,6 @@ import java.util.*;
 
 public class Unicorn implements UnicornConst, ArmConst, Arm64Const, M68kConst, SparcConst, MipsConst, X86Const { 
 
-   // Scales to calculate timeout on microsecond unit
-   // 1 second = 1000,000 microseconds
-   public static final int UC_SECOND_SCALE = 1000000;
-   // 1 milisecond = 1000 nanoseconds
-   public static final int UC_MILISECOND_SCALE = 1000;
-
    private long blockHandle = 0;
    private long interruptHandle = 0;
    private long codeHandle = 0;
@@ -622,8 +616,26 @@ public class Unicorn implements UnicornConst, ArmConst, Arm64Const, M68kConst, S
  *
  * @param address Base address of the memory range
  * @param size    Size of the memory block.
+ * @param perms   Permissions on the memory block. A combination of UC_PROT_READ, UC_PROT_WRITE, UC_PROT_EXEC
  */
    public native void mem_map(long address, long size, int perms) throws UnicornException;
 
+/**
+ * Unmap a range of memory.
+ *
+ * @param address Base address of the memory range
+ * @param size    Size of the memory block.
+ */
+   public native void mem_unmap(long address, long size) throws UnicornException;
+
+/**
+ * Change permissions on a range of memory.
+ *
+ * @param address Base address of the memory range
+ * @param size    Size of the memory block.
+ * @param perms   New permissions on the memory block. A combination of UC_PROT_READ, UC_PROT_WRITE, UC_PROT_EXEC
+ */
+   public native void mem_protect(long address, long size, int perms) throws UnicornException;
+
 }
 
diff --git a/bindings/java/unicorn_Unicorn.c b/bindings/java/unicorn_Unicorn.c
index cd0428f9..8f06af08 100644
--- a/bindings/java/unicorn_Unicorn.c
+++ b/bindings/java/unicorn_Unicorn.c
@@ -513,3 +513,33 @@ JNIEXPORT void JNICALL Java_unicorn_Unicorn_mem_1map
       throwException(env, err);
    }
 }
+
+/*
+ * Class:     unicorn_Unicorn
+ * Method:    mem_unmap
+ * Signature: (JJ)V
+ */
+JNIEXPORT void JNICALL Java_unicorn_Unicorn_mem_1unmap
+  (JNIEnv *env, jobject self, jlong address, jlong size) {
+   uch handle = getHandle(env, self);
+
+   uc_err err = uc_mem_unmap(handle, (uint64_t)address, (size_t)size);
+   if (err != UC_ERR_OK) {
+      throwException(env, err);
+   }
+}
+
+/*
+ * Class:     unicorn_Unicorn
+ * Method:    mem_protect
+ * Signature: (JJI)V
+ */
+JNIEXPORT void JNICALL Java_unicorn_Unicorn_mem_1protect
+  (JNIEnv *env, jobject self, jlong address, jlong size, jint perms) {
+   uch handle = getHandle(env, self);
+
+   uc_err err = uc_mem_protect(handle, (uint64_t)address, (size_t)size, (uint32_t)perms);
+   if (err != UC_ERR_OK) {
+      throwException(env, err);
+   }
+}