diff --git a/src/codegen_ops_x86-64.h b/src/codegen_ops_x86-64.h
index fb025aa..4561088 100644
--- a/src/codegen_ops_x86-64.h
+++ b/src/codegen_ops_x86-64.h
@@ -3744,10 +3744,10 @@ static int64_t x87_fround(double b)
                 case 0: /*Nearest*/
                 a = (int64_t)floor(b);
                 c = (int64_t)floor(b + 1.0);
-                if ((b - a) < (b - c))
+                if ((b - a) < (c - b))
                         return a;
-                else if ((b - a) > (b - c))
-                        return b;
+                else if ((b - a) > (c - b))
+                        return c;
                 else
                         return (a & 1) ? c : a;
                 case 1: /*Down*/
diff --git a/src/codegen_ops_x86.h b/src/codegen_ops_x86.h
index 79a50f3..110cb14 100644
--- a/src/codegen_ops_x86.h
+++ b/src/codegen_ops_x86.h
@@ -2261,10 +2261,10 @@ static int32_t x87_fround32(double b)
                 case 0: /*Nearest*/
                 a = (int64_t)floor(b);
                 c = (int64_t)floor(b + 1.0);
-                if ((b - a) < (b - c))
+                if ((b - a) < (c - b))
                         return a;
-                else if ((b - a) > (b - c))
-                        return b;
+                else if ((b - a) > (c - b))
+                        return c;
                 else
                         return (a & 1) ? c : a;
                 case 1: /*Down*/
@@ -2284,10 +2284,10 @@ static int64_t x87_fround64(double b)
                 case 0: /*Nearest*/
                 a = (int64_t)floor(b);
                 c = (int64_t)floor(b + 1.0);
-                if ((b - a) < (b - c))
+                if ((b - a) < (c - b))
                         return a;
-                else if ((b - a) > (b - c))
-                        return b;
+                else if ((b - a) > (c - b))
+                        return c;
                 else
                         return (a & 1) ? c : a;
                 case 1: /*Down*/
diff --git a/src/x87_ops.h b/src/x87_ops.h
index 1cd4e8c..ef68423 100644
--- a/src/x87_ops.h
+++ b/src/x87_ops.h
@@ -73,10 +73,10 @@ static inline int64_t x87_fround(double b)
                 case 0: /*Nearest*/
                 a = (int64_t)floor(b);
                 c = (int64_t)floor(b + 1.0);
-                if ((b - a) < (b - c))
+                if ((b - a) < (c - b))
                         return a;
-                else if ((b - a) > (b - c))
-                        return b;
+                else if ((b - a) > (c - b))
+                        return c;
                 else
                         return (a & 1) ? c : a;
                 case 1: /*Down*/