diff -Nru stimfit-0.15.3/debian/changelog stimfit-0.15.3/debian/changelog
--- stimfit-0.15.3/debian/changelog	2016-07-14 10:12:45.000000000 +0000
+++ stimfit-0.15.3/debian/changelog	2016-12-09 00:34:10.000000000 +0000
@@ -1,3 +1,9 @@
+stimfit (0.15.3-1+rpi1) stretch-staging; urgency=medium
+
+  * Add typecast to fix build failure on architectures where char is unsigned..
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Fri, 09 Dec 2016 00:34:10 +0000
+
 stimfit (0.15.3-1) unstable; urgency=low
 
   * Fix building with gcc-6 (Closes: #811904)
diff -Nru stimfit-0.15.3/debian/patches/fix-char-signedness.patch stimfit-0.15.3/debian/patches/fix-char-signedness.patch
--- stimfit-0.15.3/debian/patches/fix-char-signedness.patch	1970-01-01 00:00:00.000000000 +0000
+++ stimfit-0.15.3/debian/patches/fix-char-signedness.patch	2016-12-09 00:34:10.000000000 +0000
@@ -0,0 +1,14 @@
+Description: Add typecast to fix build failure on architectures where char is unsigned..
+Author: Peter Michael Green <plugwash@raspbian.org>
+
+--- stimfit-0.15.3.orig/src/libbiosiglite/biosig4c++/t210/codes.h
++++ stimfit-0.15.3/src/libbiosiglite/biosig4c++/t210/codes.h
+@@ -22,7 +22,7 @@ Foundation, Inc., 59 Temple Place - Suit
+ #ifndef __CODES_H__
+ #define __CODES_H__
+ 
+-static const char STR_END[]={-1,'\0'};
++static const char STR_END[]={(char)-1,'\0'};
+ static char STR_NULL[]=" unspecified/unknown ";
+ 
+ static alfabetic _special[]={
diff -Nru stimfit-0.15.3/debian/patches/series stimfit-0.15.3/debian/patches/series
--- stimfit-0.15.3/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ stimfit-0.15.3/debian/patches/series	2016-12-09 00:34:10.000000000 +0000
@@ -0,0 +1 @@
+fix-char-signedness.patch