diff --git a/include/libopencm3/stm32/f1/flash.h b/include/libopencm3/stm32/f1/flash.h
index fef12574..4ea697b3 100644
--- a/include/libopencm3/stm32/f1/flash.h
+++ b/include/libopencm3/stm32/f1/flash.h
@@ -22,7 +22,7 @@
  * For details see:
  * PM0075 programming manual: STM32F10xxx Flash programming
  * August 2010, Doc ID 17863 Rev 1
- * http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/PROGRAMMING_MANUAL/CD00283419.pdf
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/programming_manual/CD00283419.pdf
  */
 
 #ifndef LIBOPENCM3_FLASH_H
diff --git a/include/libopencm3/stm32/f2/flash.h b/include/libopencm3/stm32/f2/flash.h
index 3e6816f9..47c981f1 100644
--- a/include/libopencm3/stm32/f2/flash.h
+++ b/include/libopencm3/stm32/f2/flash.h
@@ -23,7 +23,7 @@
  * PM0059 Programming manual: STM32F205xx, STM32F207xx, STM32F215xx, STM32F217xx
  * Flash programming
  * May 2011, Doc ID 15687 Rev 4
- * http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/PROGRAMMING_MANUAL/CD00233952.pdf
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/programming_manual/CD00233952.pdf
  */
 
 #ifndef LIBOPENCM3_FLASH_H
diff --git a/include/libopencm3/stm32/f4/flash.h b/include/libopencm3/stm32/f4/flash.h
index 8e7ed300..aa78d191 100644
--- a/include/libopencm3/stm32/f4/flash.h
+++ b/include/libopencm3/stm32/f4/flash.h
@@ -22,7 +22,7 @@
  * For details see:
  * PM0081 Programming manual: STM32F40xxx and STM32F41xxx Flash programming
  * September 2011, Doc ID 018520 Rev 1
- * http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/PROGRAMMING_MANUAL/DM00023388.pdf
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/programming_manual/DM00023388.pdf
  */
 
 #ifndef LIBOPENCM3_FLASH_H