diff --git a/src/chain.cpp b/src/chain.cpp
index e13c04786..3dbaf5a36 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -57,3 +57,52 @@ const CBlockIndex *CChain::FindFork(const CBlockIndex *pindex) const {
         pindex = pindex->pprev;
     return pindex;
 }
+
+/** Turn the lowest '1' bit in the binary representation of a number into a '0'. */
+int static inline InvertLowestOne(int n) { return n & (n - 1); }
+
+/** Compute what height to jump back to with the CBlockIndex::pskip pointer. */
+int static inline GetSkipHeight(int height) {
+    if (height < 2)
+        return 0;
+
+    // Determine which height to jump back to. Any number strictly lower than height is acceptable,
+    // but the following expression seems to perform well in simulations (max 110 steps to go back
+    // up to 2**18 blocks).
+    return (height & 1) ? InvertLowestOne(InvertLowestOne(height - 1)) + 1 : InvertLowestOne(height);
+}
+
+CBlockIndex* CBlockIndex::GetAncestor(int height)
+{
+    if (height > nHeight || height < 0)
+        return NULL;
+
+    CBlockIndex* pindexWalk = this;
+    int heightWalk = nHeight;
+    while (heightWalk > height) {
+        int heightSkip = GetSkipHeight(heightWalk);
+        int heightSkipPrev = GetSkipHeight(heightWalk - 1);
+        if (heightSkip == height ||
+            (heightSkip > height && !(heightSkipPrev < heightSkip - 2 &&
+                                      heightSkipPrev >= height))) {
+            // Only follow pskip if pprev->pskip isn't better than pskip->pprev.
+            pindexWalk = pindexWalk->pskip;
+            heightWalk = heightSkip;
+        } else {
+            pindexWalk = pindexWalk->pprev;
+            heightWalk--;
+        }
+    }
+    return pindexWalk;
+}
+
+const CBlockIndex* CBlockIndex::GetAncestor(int height) const
+{
+    return const_cast<CBlockIndex*>(this)->GetAncestor(height);
+}
+
+void CBlockIndex::BuildSkip()
+{
+    if (pprev)
+        pskip = pprev->GetAncestor(GetSkipHeight(nHeight));
+}
diff --git a/src/main.cpp b/src/main.cpp
index bc08c3ea2..7533c3261 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2618,54 +2618,6 @@ static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned
     return (nFound >= nRequired);
 }
 
-/** Turn the lowest '1' bit in the binary representation of a number into a '0'. */
-int static inline InvertLowestOne(int n) { return n & (n - 1); }
-
-/** Compute what height to jump back to with the CBlockIndex::pskip pointer. */
-int static inline GetSkipHeight(int height) {
-    if (height < 2)
-        return 0;
-
-    // Determine which height to jump back to. Any number strictly lower than height is acceptable,
-    // but the following expression seems to perform well in simulations (max 110 steps to go back
-    // up to 2**18 blocks).
-    return (height & 1) ? InvertLowestOne(InvertLowestOne(height - 1)) + 1 : InvertLowestOne(height);
-}
-
-CBlockIndex* CBlockIndex::GetAncestor(int height)
-{
-    if (height > nHeight || height < 0)
-        return NULL;
-
-    CBlockIndex* pindexWalk = this;
-    int heightWalk = nHeight;
-    while (heightWalk > height) {
-        int heightSkip = GetSkipHeight(heightWalk);
-        int heightSkipPrev = GetSkipHeight(heightWalk - 1);
-        if (heightSkip == height ||
-            (heightSkip > height && !(heightSkipPrev < heightSkip - 2 &&
-                                      heightSkipPrev >= height))) {
-            // Only follow pskip if pprev->pskip isn't better than pskip->pprev.
-            pindexWalk = pindexWalk->pskip;
-            heightWalk = heightSkip;
-        } else {
-            pindexWalk = pindexWalk->pprev;
-            heightWalk--;
-        }
-    }
-    return pindexWalk;
-}
-
-const CBlockIndex* CBlockIndex::GetAncestor(int height) const
-{
-    return const_cast<CBlockIndex*>(this)->GetAncestor(height);
-}
-
-void CBlockIndex::BuildSkip()
-{
-    if (pprev)
-        pskip = pprev->GetAncestor(GetSkipHeight(nHeight));
-}
 
 bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp)
 {