diff --git a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/EnvironmentBlock.java b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/EnvironmentBlock.java
index 4beae1906b4..44632206723 100644
--- a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/EnvironmentBlock.java
+++ b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/EnvironmentBlock.java
@@ -994,6 +994,7 @@ public class EnvironmentBlock extends AbstractCOptionPage {
 		table.setLayout(tableLayout);
 		table.setHeaderVisible(true);
 		GridData gd = new GridData(GridData.FILL_BOTH);
+		gd.heightHint = 50;
 		tableViewer.getControl().setLayoutData(gd);
 		tableViewer.setContentProvider(new EnvironmentContentProvider());
 		tableViewer.setLabelProvider(new EnvironmentLabelProvider(editable));
diff --git a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/MacrosBlock.java b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/MacrosBlock.java
index c3307872e38..3b47c49dc49 100644
--- a/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/MacrosBlock.java
+++ b/build/org.eclipse.cdt.managedbuilder.ui/src/org/eclipse/cdt/managedbuilder/internal/ui/MacrosBlock.java
@@ -1079,6 +1079,7 @@ public class MacrosBlock extends AbstractCOptionPage {
 		table.setLayout(tableLayout);
 		table.setHeaderVisible(true);
 		GridData gd = new GridData(GridData.FILL_BOTH);
+		gd.heightHint = 50;
 		tableViewer.getControl().setLayoutData(gd);
 		tableViewer.setContentProvider(new MacroContentProvider());
 		tableViewer.setLabelProvider(new MacroLabelProvider(editable));