diff --git a/src/side_chain.cpp b/src/side_chain.cpp
index c8d285f..6f44d1b 100644
--- a/src/side_chain.cpp
+++ b/src/side_chain.cpp
@@ -27,6 +27,7 @@
 #include "intrin_portable.h"
 #include "keccak.h"
 #include "p2p_server.h"
+#include "stratum_server.h"
 #include "params.h"
 #include "json_parsers.h"
 #include <rapidjson/document.h>
@@ -985,7 +986,8 @@ void SideChain::verify_loop(PoolBlock* block)
 
 			// This block is now verified
 
-			if (is_longer_chain(highest_block, block)) {
+			bool is_alternative;
+			if (is_longer_chain(highest_block, block, is_alternative)) {
 				highest_block = block;
 			}
 			else if (highest_block && (highest_block->m_sidechainHeight > block->m_sidechainHeight)) {
@@ -1330,7 +1332,8 @@ void SideChain::update_chain_tip(PoolBlock* block)
 		return;
 	}
 
-	if (is_longer_chain(m_chainTip, block)) {
+	bool is_alternative;
+	if (is_longer_chain(m_chainTip, block, is_alternative)) {
 		difficulty_type diff;
 		if (get_difficulty(block, m_difficultyData, diff)) {
 			m_chainTip = block;
@@ -1343,6 +1346,12 @@ void SideChain::update_chain_tip(PoolBlock* block)
 			block->m_wantBroadcast = true;
 			if (m_pool) {
 				m_pool->update_block_template_async();
+
+				// Reset stratum share counters when switching to an alternative chain to avoid confusion
+				StratumServer* s = m_pool->stratum_server();
+				if (s && is_alternative) {
+					s->reset_share_counters();
+				}
 			}
 			prune_old_blocks();
 		}
@@ -1405,8 +1414,10 @@ PoolBlock* SideChain::get_parent(const PoolBlock* block)
 	return nullptr;
 }
 
-bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candidate)
+bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candidate, bool& is_alternative)
 {
+	is_alternative = false;
+
 	if (!candidate || !candidate->m_verified || candidate->m_invalid) {
 		return false;
 	}
@@ -1449,6 +1460,8 @@ bool SideChain::is_longer_chain(const PoolBlock* block, const PoolBlock* candida
 	}
 
 	// They're on totally different chains. Compare total difficulties over the last m_chainWindowSize blocks
+	is_alternative = true;
+
 	difficulty_type block_total_diff;
 	difficulty_type candidate_total_diff;
 
diff --git a/src/side_chain.h b/src/side_chain.h
index be771dd..c0caa1f 100644
--- a/src/side_chain.h
+++ b/src/side_chain.h
@@ -91,7 +91,7 @@ private:
 	PoolBlock* get_parent(const PoolBlock* block);
 
 	// Checks if "candidate" has longer (higher difficulty) chain than "block"
-	bool is_longer_chain(const PoolBlock* block, const PoolBlock* candidate);
+	bool is_longer_chain(const PoolBlock* block, const PoolBlock* candidate, bool& is_alternative);
 	void update_depths(PoolBlock* block);
 	void prune_old_blocks();
 
diff --git a/src/stratum_server.cpp b/src/stratum_server.cpp
index e25fe9b..e920be4 100644
--- a/src/stratum_server.cpp
+++ b/src/stratum_server.cpp
@@ -439,6 +439,13 @@ void StratumServer::print_status()
 	print_stratum_status();
 }
 
+void StratumServer::reset_share_counters()
+{
+	m_cumulativeHashesAtLastShare = 0;
+	m_cumulativeFoundSharesDiff = 0.0;
+	m_totalFoundShares = 0;
+}
+
 void StratumServer::print_stratum_status() const
 {
 	uint64_t hashes_15m, hashes_1h, hashes_24h, total_hashes;
@@ -473,8 +480,9 @@ void StratumServer::print_stratum_status() const
 	const uint64_t hashrate_24h = (dt_24h > 0) ? (hashes_24h / dt_24h) : 0;
 
 	double average_effort = 0.0;
-	if (m_cumulativeFoundSharesDiff > 0.0) {
-		average_effort = static_cast<double>(m_cumulativeHashesAtLastShare) * 100.0 / m_cumulativeFoundSharesDiff;
+	const double diff = m_cumulativeFoundSharesDiff;
+	if (diff > 0.0) {
+		average_effort = static_cast<double>(m_cumulativeHashesAtLastShare) * 100.0 / diff;
 	}
 
 	LOGINFO(0, "status" <<
@@ -1028,8 +1036,9 @@ void StratumServer::api_update_local_stats(time_t timestamp)
 	const uint64_t hashrate_24h = (dt_24h > 0) ? (hashes_24h / dt_24h) : 0;
 
 	double average_effort = 0.0;
-	if (m_cumulativeFoundSharesDiff > 0.0) {
-		average_effort = static_cast<double>(m_cumulativeHashesAtLastShare) * 100.0 / m_cumulativeFoundSharesDiff;
+	const double diff = m_cumulativeFoundSharesDiff;
+	if (diff > 0.0) {
+		average_effort = static_cast<double>(m_cumulativeHashesAtLastShare) * 100.0 / diff;
 	}
 
 	int shares_found = m_totalFoundShares;
diff --git a/src/stratum_server.h b/src/stratum_server.h
index b020ecc..3bb6535 100644
--- a/src/stratum_server.h
+++ b/src/stratum_server.h
@@ -75,6 +75,8 @@ public:
 
 	void print_status() override;
 
+	void reset_share_counters();
+
 private:
 	void print_stratum_status() const;