diff --git a/cpp/frameset.cpp b/cpp/frameset.cpp
index 27edc0b..06ce6bd 100644
--- a/cpp/frameset.cpp
+++ b/cpp/frameset.cpp
@@ -83,7 +83,7 @@ void FrameSet::handleMatch(const internal::RangePatternMatch* match, Status* ok)
     ok->clearError();
 
     Frame start, end;
-    size_t step = 1;
+    long step = 1;
 
     switch (num) {
 
diff --git a/cpp/private/frameset_p.cpp b/cpp/private/frameset_p.cpp
index b27bb77..17b867e 100644
--- a/cpp/private/frameset_p.cpp
+++ b/cpp/private/frameset_p.cpp
@@ -28,6 +28,9 @@ bool getRangePatternMatch(RangePatternMatch &match, const std::string &range) {
     // Complex range:  1-10x2
     static const char* s_pattern3 = R"(^(-?\d+)-(-?\d+)([:xy])(-?\d+)$)";
 
+    match.stepMod.clear();
+    match.step = 1;
+
 #if HAVE_REGEX == 1
     static const auto flags = std::regex_constants::optimize|std::regex_constants::ECMAScript;
     static const std::regex s_rxRange1(s_pattern1, flags);
@@ -36,9 +39,6 @@ bool getRangePatternMatch(RangePatternMatch &match, const std::string &range) {
 
     std::smatch submatch;
 
-    match.stepMod.clear();
-    match.step = 1;
-
     if ( std::regex_match(range, submatch, s_rxRange1) ) {
         match.matches = 2;
         match.start = std::stol(submatch[1].str(), nullptr);
@@ -58,7 +58,7 @@ bool getRangePatternMatch(RangePatternMatch &match, const std::string &range) {
         match.start = std::stol(submatch[1].str(), nullptr);
         match.end = std::stol(submatch[2].str(), nullptr);
         match.stepMod = submatch[3].str();
-        match.step = std::stoul(submatch[4].str(), nullptr);
+        match.step = std::stol(submatch[4].str(), nullptr);
         return true;
     }
 #else
diff --git a/cpp/private/frameset_p.h b/cpp/private/frameset_p.h
index afda85a..6640a08 100644
--- a/cpp/private/frameset_p.h
+++ b/cpp/private/frameset_p.h
@@ -37,7 +37,7 @@ struct RangePatternMatch { ;
     Frame start;
     Frame end;
     std::string stepMod;
-    size_t step;
+    long step;
 };
 
 // Regular expression patterns for matching frame set strings.
diff --git a/cpp/ranges/ranges.cpp b/cpp/ranges/ranges.cpp
index 68cb35b..258779d 100644
--- a/cpp/ranges/ranges.cpp
+++ b/cpp/ranges/ranges.cpp
@@ -11,7 +11,7 @@
 namespace fileseq {
 
 
-Range::Range(long start, long end, int step)
+Range::Range(long start, long end, long step)
     : m_start(start)
     , m_end(end)
     , m_step(step)
@@ -103,7 +103,7 @@ bool Range::contains(long value) const {
 }
 
 
-long Range::closestInRange(long value, long start, long end, int step) const {
+long Range::closestInRange(long value, long start, long end, long step) const {
     // Possibly clamp the value if it is outside the range
     if (end >= start) {
         if (value < start) {
@@ -137,7 +137,7 @@ long Range::value(size_t idx, Status* ok) const {
     // Calculate the value as an offset from the start
     long l_start = start();
     long l_end = end();
-    int l_step = step();
+    long l_step = step();
 
     long val = l_start + (l_step * idx);
 
@@ -303,7 +303,7 @@ bool predDecRangeDone(long val, long end) {
     return val >= end;
 }
 
-void Ranges::appendUnique(long start, long end, int step) {
+void Ranges::appendUnique(long start, long end, long step) {
     if (step == 0) {
         // Invalid step. Do nothing.
         return;
@@ -451,7 +451,7 @@ void Ranges::normalized(Ranges &outRanges, bool invert) const {
     long start = 0;
     long end = 0;
     long current = 0;
-    int step = 0;
+    long step = 0;
     bool keepValue = false;
     size_t pending = 0;
 
diff --git a/cpp/ranges/ranges.h b/cpp/ranges/ranges.h
index 58d49ae..334a59b 100644
--- a/cpp/ranges/ranges.h
+++ b/cpp/ranges/ranges.h
@@ -34,7 +34,7 @@ class RangeIterator {
     // Advance to the next value.
     bool next();
 
-    // Returns whether the interator points to a valid range
+    // Returns whether the iterator points to a valid range
     bool isValid() const { return m_range != NULL; }
 
 private:
@@ -58,7 +58,7 @@ class Range {
     // If step value == 0, it will automatically default
     // to a propert increment depending on whether start is
     // less than or greather than end.
-    Range(long start, long end, int step=0);
+    Range(long start, long end, long step=0);
 
     virtual ~Range() {}
 
@@ -77,7 +77,7 @@ class Range {
     long end() const;
 
     // returns the stepping value used in the range
-    int step() const { return m_step; }
+    long step() const { return m_step; }
 
     // returns the smallest value in the range
     long min() const { return (start() < end() ? start() : end()); }
@@ -122,12 +122,12 @@ class Range {
     // closestInRange finds the closest valid value within the range,
     // to a given value. Values outside the range are clipped to either
     // the range min or max.
-    long closestInRange(long value, long start, long end, int step=0) const;
+    long closestInRange(long value, long start, long end, long step=0) const;
 
 private:
     long m_start;
     long m_end;
-    int m_step;
+    long m_step;
 
     mutable long m_cachedEnd;
     mutable bool m_isEndCached;
@@ -221,14 +221,14 @@ class Ranges {
     // to the total range list.
     // Values in new range may duplicate values in
     // existing ranges.
-    void append(long start, long end, int step=0) {
+    void append(long start, long end, long step=0) {
         m_blocks.push_back(new Range(start, end, step));
     }
 
     // creates and adds another range of values
     // to the total range list. Only unique values from the
     // given range are appended to the total range.
-    void appendUnique(long start, long end, int step=0);
+    void appendUnique(long start, long end, long step=0);
 
     // returns true if a given value is a valid
     // value within the total range.