diff --git a/private/tfocs_backtrack.m b/private/tfocs_backtrack.m
index eab6b48..1b766d2 100644
--- a/private/tfocs_backtrack.m
+++ b/private/tfocs_backtrack.m
@@ -1,13 +1,19 @@
 % TFOCS_BACKTRACK
 % Backtracking helper script.
 
+do_break    = false; % added for compatibility with R2015b
+while true
+
 % Quick exit for no backtracking
-if beta >= 1, break; end % SRB changing == to >=
+if beta >= 1
+    do_break = true;
+    break; 
+end % SRB changing == to >=
 
 % Quick exit if no progress made
 xy = x - y;
 xy_sq = tfocs_normsq( xy );
-if xy_sq == 0, localL = Inf; break; end
+if xy_sq == 0, localL = Inf; do_break=true; break; end
 %fprintf('xy_sq/x is %.2e\n', xy_sq/tfocs_normsq(x) );
 if xy_sq/tfocs_normsq(x) < eps, cntr_Ax=Inf; end % force a reset
 
@@ -28,12 +34,17 @@
 
 % Exit if Lipschitz criterion satisfied, or if we hit Lexact
 backtrack_steps = backtrack_steps + 1;
-if localL <= L || L >= Lexact, break; end
+if localL <= L || L >= Lexact, do_break=true; break; end
 if ~isinf( localL ), 
     L = min( Lexact, localL );
-elseif isinf( localL ), localL = L; end
+elseif isinf( localL )
+    localL = L;
+end
 L = min( Lexact, max( localL, L / beta ) );
 
+break;
+end % end of "while true"
+
 % TFOCS v1.3 by Stephen Becker, Emmanuel Candes, and Michael Grant.
 % Copyright 2013 California Institute of Technology and CVX Research.
 % See the file LICENSE for full license information.
diff --git a/private/tfocs_iterate.m b/private/tfocs_iterate.m
index 799b236..380f54e 100644
--- a/private/tfocs_iterate.m
+++ b/private/tfocs_iterate.m
@@ -315,9 +315,15 @@
 end
 
 % Exit if positive stopping criteria met
-if ~isempty( status ),
-	break;
-end
+% if ~isempty( status ),
+% 	break;
+% end
+
+% for R2015b compatibility:
+do_break    = false;
+if ~isempty( status )
+    do_break = true;
+else
 
 % Restart acceleration if necessary
 backtrack_steps = 0;
@@ -353,6 +359,8 @@
 
 C_y     = Inf;
 
+end
+
 % TFOCS v1.3 by Stephen Becker, Emmanuel Candes, and Michael Grant.
 % Copyright 2013 California Institute of Technology and CVX Research.
 % See the file LICENSE for full license information.
diff --git a/tfocs_AT.m b/tfocs_AT.m
index 0940bd3..44f1631 100644
--- a/tfocs_AT.m
+++ b/tfocs_AT.m
@@ -76,11 +76,13 @@
         
         % Perform backtracking tests
         tfocs_backtrack
+        if do_break, break; end % new, for R2015b compatibility
         
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end
     
 end
 
diff --git a/tfocs_GRA.m b/tfocs_GRA.m
index 1597fe5..ba44c4d 100644
--- a/tfocs_GRA.m
+++ b/tfocs_GRA.m
@@ -35,11 +35,13 @@
         
         % Backtracking
         tfocs_backtrack
+        if do_break, break; end % new, for R2015b compatibility
         
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end % new, for R2015b compatibility
     
 end
 
diff --git a/tfocs_LLM.m b/tfocs_LLM.m
index 939cf07..cf7172b 100644
--- a/tfocs_LLM.m
+++ b/tfocs_LLM.m
@@ -50,11 +50,13 @@
         
         % Backtracking test
         tfocs_backtrack
+        if do_break, break; end % new, for R2015b compatibility
         
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end % new, for R2015b compatibility
 	
 	% Scaled gradient. This step must be skipped if restart occurs
     if theta == 1 || isinf(theta)
diff --git a/tfocs_N07.m b/tfocs_N07.m
index 6f3e7e8..5811178 100644
--- a/tfocs_N07.m
+++ b/tfocs_N07.m
@@ -52,11 +52,12 @@
         
         % Backtracking test
         tfocs_backtrack
-        
+        if do_break, break; end % new, for R2015b compatibility
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end % new, for R2015b compatibility
 	
 	% Accumulated gradient. This step must be skipped if restart occurs
     if theta == 1 || isinf(theta)
diff --git a/tfocs_N83.m b/tfocs_N83.m
index 2c61825..15814c0 100644
--- a/tfocs_N83.m
+++ b/tfocs_N83.m
@@ -51,11 +51,13 @@
         
         % Backtracking test
         tfocs_backtrack
+        if do_break, break; end % new, for R2015b compatibility
         
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end % new, for R2015b compatibility
 
     % Reversed z update. This step is skipped if restart occurs
     if theta == 1,
diff --git a/tfocs_TS.m b/tfocs_TS.m
index 56734f7..e27ed9c 100644
--- a/tfocs_TS.m
+++ b/tfocs_TS.m
@@ -67,11 +67,13 @@
         
         % Bactracking test
         tfocs_backtrack
+        if do_break, break; end % new, for R2015b compatibility
         
     end
     
     % Collect data, evaluate stopping criteria, and print status
     tfocs_iterate
+    if do_break, break; end % new, for R2015b compatibility
     
     g_a_old = g_a;