diff --git a/HISTORY.md b/HISTORY.md
index 170b61a..1a0b4ac 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -4,6 +4,9 @@ A Makefile for Arduino Sketches
 The following is the rough list of changes that went into different versions.
 I tried to give credit whenever possible. If I have missed anyone, kindly add it to the list.
 
+### 1.1.0 (in development)
+- Don't append port details to avrdude for usbasp. See #123
+
 ### 1.0.1 (2013-09-25)
 - Unconditionally add -D in avrdude options. See #114
 
diff --git a/arduino-mk/Arduino.mk b/arduino-mk/Arduino.mk
index 1862548..f3584ae 100644
--- a/arduino-mk/Arduino.mk
+++ b/arduino-mk/Arduino.mk
@@ -1011,7 +1011,11 @@ ifndef AVRDUDE_ISP_FUSES_POST
     endif
 endif
 
-AVRDUDE_ISP_OPTS = -c $(ISP_PROG) -b $(AVRDUDE_ISP_BAUDRATE) -P $(call get_isp_port)
+AVRDUDE_ISP_OPTS = -c $(ISP_PROG) -b $(AVRDUDE_ISP_BAUDRATE)
+
+ifneq ($(strip $(ISP_PROG)),usbasp)
+    AVRDUDE_ISP_OPTS += -P $(call get_isp_port)
+endif
 
 ifndef ISP_EEPROM
     ISP_EEPROM  = 0