diff --git a/jscl/src/main/java/jscl/JsclMathEngine.java b/jscl/src/main/java/jscl/JsclMathEngine.java
index f58333f0..8a59b2fe 100644
--- a/jscl/src/main/java/jscl/JsclMathEngine.java
+++ b/jscl/src/main/java/jscl/JsclMathEngine.java
@@ -9,7 +9,6 @@ import jscl.math.operator.Percent;
 import jscl.math.operator.Rand;
 import jscl.math.operator.matrix.OperatorsRegistry;
 import jscl.text.ParseException;
-import midpcalc.Real;
 import org.solovyev.common.NumberFormatter;
 import org.solovyev.common.math.MathRegistry;
 import org.solovyev.common.msg.MessageRegistry;
@@ -168,10 +167,10 @@ public class JsclMathEngine implements MathEngine {
             }
         }
         final NumberFormatter nf = numberFormatter.get();
-        nf.setGroupingSeparator(useGroupingSeparator ? groupingSeparator : NumberFormatter.NO_GROUPING);
+        nf.setGroupingSeparator(useGroupingSeparator ? getGroupingSeparatorChar(nb) : NumberFormatter.NO_GROUPING);
         nf.setPrecision(roundResult ? precision : NumberFormatter.NO_ROUNDING);
         switch (numberFormat) {
-            case Real.NumberFormat.FSE_ENG:
+            case FSE_ENG:
                 nf.useEngineeringFormat(NumberFormatter.DEFAULT_MAGNITUDE);
                 break;
             case FSE_SCI:
@@ -251,7 +250,7 @@ public class JsclMathEngine implements MathEngine {
     @Nonnull
     public String addGroupingSeparators(@Nonnull NumeralBase nb, @Nonnull String ungroupedDoubleValue) {
         if (useGroupingSeparator) {
-            final String groupingSeparator = nb == NumeralBase.dec ? String.valueOf(this.groupingSeparator) : " ";
+            final String groupingSeparator = getGroupingSeparator(nb);
 
             final int dotIndex = ungroupedDoubleValue.indexOf(".");
 
@@ -277,6 +276,15 @@ public class JsclMathEngine implements MathEngine {
         }
     }
 
+    @Nonnull
+    private String getGroupingSeparator(@Nonnull NumeralBase nb) {
+        return nb == NumeralBase.dec ? String.valueOf(groupingSeparator) : " ";
+    }
+
+    private char getGroupingSeparatorChar(@Nonnull NumeralBase nb) {
+        return nb == NumeralBase.dec ? groupingSeparator : ' ';
+    }
+
     @Nonnull
     private StringBuilder insertSeparators(@Nonnull NumeralBase nb,
                                            @Nonnull String groupingSeparator,
diff --git a/jscl/src/test/java/jscl/JsclMathEngineTest.java b/jscl/src/test/java/jscl/JsclMathEngineTest.java
index 96043c89..92b271fa 100644
--- a/jscl/src/test/java/jscl/JsclMathEngineTest.java
+++ b/jscl/src/test/java/jscl/JsclMathEngineTest.java
@@ -77,12 +77,31 @@ public class JsclMathEngineTest {
         assertEquals("13D", me.format(317d, NumeralBase.hex));
     }
 
+
     @Test
     public void testPiComputation() throws Exception {
         final JsclMathEngine me = JsclMathEngine.getInstance();
         assertEquals("-1+0.0000000000000001*i", me.evaluate("exp(√(-1)*Π)"));
     }
 
+    @Test
+    public void testBinShouldAlwaysUseSpaceAsGroupingSeparator() throws Exception {
+        final JsclMathEngine me = new JsclMathEngine();
+        me.setGroupingSeparator('\'');
+        me.setUseGroupingSeparator(true);
+
+        assertEquals("100 0000 0000", me.format(1024d, NumeralBase.bin));
+    }
+
+    @Test
+    public void testHexShouldAlwaysUseSpaceAsGroupingSeparator() throws Exception {
+        final JsclMathEngine me = new JsclMathEngine();
+        me.setGroupingSeparator('\'');
+        me.setUseGroupingSeparator(true);
+
+        assertEquals("4 00", me.format(1024d, NumeralBase.hex));
+    }
+
     @Test
     public void testEngineeringNotationWithRounding() throws Exception {
         final JsclMathEngine me = JsclMathEngine.getInstance();
@@ -114,6 +133,7 @@ public class JsclMathEngineTest {
         assertEquals("-999", me.format(-999d));
         assertEquals("-999.99", me.format(-999.99d));
         assertEquals("-0.1", me.format(-0.1d));
+
         assertEquals("-0.12", me.format(-0.12d));
         assertEquals("-0.123", me.format(-0.123d));
         assertEquals("-0.1234", me.format(-0.1234d));