diff --git a/jerry-core/CMakeLists.txt b/jerry-core/CMakeLists.txt
index eb1238b244..6fc9ced7c5 100644
--- a/jerry-core/CMakeLists.txt
+++ b/jerry-core/CMakeLists.txt
@@ -19,6 +19,7 @@ project (${JERRY_CORE_NAME} C)
 # Optional features
 set(FEATURE_CPOINTER_32_BIT  OFF     CACHE BOOL   "Enable 32 bit compressed pointers?")
 set(FEATURE_DEBUGGER         OFF     CACHE BOOL   "Enable JerryScript debugger?")
+set(FEATURE_DEBUGGER_PORT    "5001"  CACHE STRING "Set debugger port number (default: 5001)")
 set(FEATURE_ERROR_MESSAGES   OFF     CACHE BOOL   "Enable error messages?")
 set(FEATURE_JS_PARSER        ON      CACHE BOOL   "Enable js-parser?")
 set(FEATURE_MEM_STATS        OFF     CACHE BOOL   "Enable memory statistics?")
@@ -40,6 +41,7 @@ endif()
 # Status messages
 message(STATUS "FEATURE_CPOINTER_32_BIT   " ${FEATURE_CPOINTER_32_BIT})
 message(STATUS "FEATURE_DEBUGGER          " ${FEATURE_DEBUGGER})
+message(STATUS "FEATURE_DEBUGGER_PORT     " ${FEATURE_DEBUGGER_PORT})
 message(STATUS "FEATURE_ERROR_MESSAGES    " ${FEATURE_ERROR_MESSAGES})
 message(STATUS "FEATURE_JS_PARSER         " ${FEATURE_JS_PARSER})
 message(STATUS "FEATURE_MEM_STATS         " ${FEATURE_MEM_STATS})
@@ -175,6 +177,9 @@ if(FEATURE_DEBUGGER)
   set(DEFINES_JERRY ${DEFINES_JERRY} JERRY_DEBUGGER)
 endif()
 
+# Debugger port
+set(DEFINES_JERRY ${DEFINES_JERRY} JERRY_DEBUGGER_PORT=${FEATURE_DEBUGGER_PORT})
+
 # Memory management stress-test mode
 if(FEATURE_MEM_STRESS_TEST)
   set(DEFINES_JERRY ${DEFINES_JERRY} JMEM_GC_BEFORE_EACH_ALLOC)
diff --git a/jerry-core/debugger/jerry-debugger-ws.c b/jerry-core/debugger/jerry-debugger-ws.c
index ab7880cf52..32e801127b 100644
--- a/jerry-core/debugger/jerry-debugger-ws.c
+++ b/jerry-core/debugger/jerry-debugger-ws.c
@@ -27,7 +27,9 @@
 /**
  * Debugger socket communication port.
  */
+#ifndef JERRY_DEBUGGER_PORT
 #define JERRY_DEBUGGER_PORT 5001
+#endif
 
 /**
  * Masking-key is available.
diff --git a/tools/build.py b/tools/build.py
index 5692a5a6f1..8154425e32 100755
--- a/tools/build.py
+++ b/tools/build.py
@@ -57,6 +57,7 @@ def devhelp(help):
     parser.add_argument('--jerry-cmdline', metavar='X', choices=['ON', 'OFF'], default='ON', type=str.upper, help='build jerry command line tool (%(choices)s; default: %(default)s)')
     parser.add_argument('--jerry-cmdline-minimal', metavar='X', choices=['ON', 'OFF'], default='OFF', type=str.upper, help='build minimal version of the jerry command line tool (%(choices)s; default: %(default)s)')
     parser.add_argument('--jerry-debugger', metavar='X', choices=['ON', 'OFF'], default='OFF', type=str.upper, help='enable the jerry debugger (%(choices)s; default: %(default)s)')
+    parser.add_argument('--jerry-debugger-port', metavar='N', action='store', type=int, default=5001, help='add custom port number (default: %(default)s)')
     parser.add_argument('--jerry-libc', metavar='X', choices=['ON', 'OFF'], default='ON', type=str.upper, help='build and use jerry-libc (%(choices)s; default: %(default)s)')
     parser.add_argument('--jerry-libm', metavar='X', choices=['ON', 'OFF'], default='ON', type=str.upper, help='build and use jerry-libm (%(choices)s; default: %(default)s)')
     parser.add_argument('--js-parser', metavar='X', choices=['ON', 'OFF'], default='ON', type=str.upper, help='enable js-parser (%(choices)s; default: %(default)s)')
@@ -119,6 +120,7 @@ def generate_build_options(arguments):
     build_options.append('-DFEATURE_PROFILE=%s' % PROFILE)
 
     build_options.append('-DFEATURE_DEBUGGER=%s' % arguments.jerry_debugger)
+    build_options.append('-DFEATURE_DEBUGGER_PORT=%d' % arguments.jerry_debugger_port)
     build_options.append('-DFEATURE_SNAPSHOT_EXEC=%s' % arguments.snapshot_exec)
     build_options.append('-DFEATURE_SNAPSHOT_SAVE=%s' % arguments.snapshot_save)
     build_options.append('-DFEATURE_SYSTEM_ALLOCATOR=%s' % arguments.system_allocator)