diff --git a/include/lbfgs.h b/include/lbfgs.h
index e499c6f..2f48995 100644
--- a/include/lbfgs.h
+++ b/include/lbfgs.h
@@ -153,9 +153,9 @@ enum {
     /** MoreThuente method proposd by More and Thuente. */
     LBFGS_LINESEARCH_MORETHUENTE = 0,
     /** Backtracking method with strong Wolfe condition. */
-    LBFGS_LINESEARCH_BACKTRACKING,
+    LBFGS_LINESEARCH_BACKTRACKING_STRONG,
     /** Backtracking method with regular Wolfe condition. */
-    LBFGS_LINESEARCH_BACKTRACKING_LOOSE,
+    LBFGS_LINESEARCH_BACKTRACKING,
 };
 
 /**
@@ -538,9 +538,9 @@ libLBFGS is distributed under the term of the
 - Version 1.6 (2008-11-02):
     - Improved line-search algorithm with strong Wolfe condition, which was
       contributed by Takashi Imamichi. This routine is now default for
-      ::LBFGS_LINESEARCH_BACKTRACKING. The previous line search algorithm
+      ::LBFGS_LINESEARCH_BACKTRACKING_STRONG. The previous line search algorithm
       with regular Wolfe condition is still available as
-      ::LBFGS_LINESEARCH_BACKTRACKING_LOOSE.
+      ::LBFGS_LINESEARCH_BACKTRACKING.
     - Configurable stop index for L1-norm computation. A member variable
       ::lbfgs_parameter_t::orthantwise_end was added to specify the index
       number at which the library stops computing the L1 norm of the
@@ -563,7 +563,7 @@ libLBFGS is distributed under the term of the
     - Configurable line search algorithms. A member variable
       ::lbfgs_parameter_t::linesearch was added to choose either MoreThuente
       method (::LBFGS_LINESEARCH_MORETHUENTE) or backtracking algorithm
-      (::LBFGS_LINESEARCH_BACKTRACKING).
+      (::LBFGS_LINESEARCH_BACKTRACKING_STRONG).
     - Fixed a bug: the previous version did not compute psuedo-gradients
       properly in the line search routines for OWL-QN. This bug might quit
       an iteration process too early when the OWL-QN routine was activated
diff --git a/lib/lbfgs.c b/lib/lbfgs.c
index a1dbc04..0f5af2f 100644
--- a/lib/lbfgs.c
+++ b/lib/lbfgs.c
@@ -362,9 +362,7 @@ int lbfgs(
         linesearch = line_search_morethuente;
         break;
     case LBFGS_LINESEARCH_BACKTRACKING:
-        linesearch = line_search_backtracking;
-        break;
-    case LBFGS_LINESEARCH_BACKTRACKING_LOOSE:
+    case LBFGS_LINESEARCH_BACKTRACKING_STRONG:
         linesearch = line_search_backtracking;
         break;
     default:
@@ -756,7 +754,7 @@ static int line_search_backtracking(
         if (*f <= finit + *stp * dgtest) {
             /* The sufficient decrease condition. */
 
-            if (param->linesearch == LBFGS_LINESEARCH_BACKTRACKING) {
+            if (param->linesearch == LBFGS_LINESEARCH_BACKTRACKING_STRONG) {
                 /* Check the strong Wolfe condition. */
                 vecdot(&dg, g, s, n);
                 if (dg > -wolfe * dginit) {
diff --git a/sample/sample.c b/sample/sample.c
index 7e06185..4e707a3 100644
--- a/sample/sample.c
+++ b/sample/sample.c
@@ -65,7 +65,7 @@ int main(int argc, char *argv)
     /* Initialize the parameters for the L-BFGS optimization. */
     lbfgs_parameter_init(&param);
     param.orthantwise_c = 1;
-    /* param.linesearch = LBFGS_LINESEARCH_BACKTRACKING; */
+    /* param.linesearch = LBFGS_LINESEARCH_BACKTRACKING_STRONG; */
 
     /*
         Start the L-BFGS optimization; this will invoke the callback functions