diff --git a/layout/generic/nsInlineFrame.cpp b/layout/generic/nsInlineFrame.cpp
index 99fe548d3a5d..dd86b9b2ca2c 100644
--- a/layout/generic/nsInlineFrame.cpp
+++ b/layout/generic/nsInlineFrame.cpp
@@ -1471,7 +1471,7 @@ nsInlineFrame::ReflowInlineFrames(nsIPresContext* aPresContext,
     // little hack lets us override that behavior to allow for more
     // precise layout in the face of imprecise fonts.
     static PRBool useComputedHeight = PR_FALSE;
-#if defined(XP_UNIX) || defined(XP_PC)
+#if defined(XP_UNIX) || defined(XP_PC) || defined(XP_BEOS)
     static PRBool firstTime = 1;
     if (firstTime) {
       if (getenv("GECKO_USE_COMPUTED_HEIGHT")) {
diff --git a/layout/html/base/src/nsInlineFrame.cpp b/layout/html/base/src/nsInlineFrame.cpp
index 99fe548d3a5d..dd86b9b2ca2c 100644
--- a/layout/html/base/src/nsInlineFrame.cpp
+++ b/layout/html/base/src/nsInlineFrame.cpp
@@ -1471,7 +1471,7 @@ nsInlineFrame::ReflowInlineFrames(nsIPresContext* aPresContext,
     // little hack lets us override that behavior to allow for more
     // precise layout in the face of imprecise fonts.
     static PRBool useComputedHeight = PR_FALSE;
-#if defined(XP_UNIX) || defined(XP_PC)
+#if defined(XP_UNIX) || defined(XP_PC) || defined(XP_BEOS)
     static PRBool firstTime = 1;
     if (firstTime) {
       if (getenv("GECKO_USE_COMPUTED_HEIGHT")) {