diff --git a/sc/source/core/tool/interpr2.cxx b/sc/source/core/tool/interpr2.cxx
index 85f2307cdf2b..0f2f5b13ef23 100644
--- a/sc/source/core/tool/interpr2.cxx
+++ b/sc/source/core/tool/interpr2.cxx
@@ -27,7 +27,6 @@
 #include <svl/zforlist.hxx>
 #include <svl/sharedstringpool.hxx>
 #include <sal/macros.h>
-#include <boost/math/special_functions/log1p.hpp>
 
 #include "attrib.hxx"
 #include "sc.hrc"
@@ -1855,7 +1854,7 @@ void ScInterpreter::ScPDuration()
         double nFuture = GetDouble();
         double nPresent = GetDouble();
         double nInterest = GetDouble();
-        PushDouble(log(nFuture / nPresent) / boost::math::log1p(nInterest));
+        PushDouble(log(nFuture / nPresent) / rtl::math::log1p(nInterest));
     }
 }
 
@@ -1972,9 +1971,9 @@ void ScInterpreter::ScNper()
         PushDouble(-(nBw + nZw)/nRmz);
     else if (bPayInAdvance)
         PushDouble(log(-(nInterest*nZw-nRmz*(1.0+nInterest))/(nInterest*nBw+nRmz*(1.0+nInterest)))
-                  /boost::math::log1p(nInterest));
+                  / rtl::math::log1p(nInterest));
     else
-        PushDouble(log(-(nInterest*nZw-nRmz)/(nInterest*nBw+nRmz))/boost::math::log1p(nInterest));
+        PushDouble(log(-(nInterest*nZw-nRmz)/(nInterest*nBw+nRmz)) / rtl::math::log1p(nInterest));
 }
 
 bool ScInterpreter::RateIteration( double fNper, double fPayment, double fPv,
diff --git a/sc/source/core/tool/interpr3.cxx b/sc/source/core/tool/interpr3.cxx
index 033763f5c6a7..a6ef36661e0d 100644
--- a/sc/source/core/tool/interpr3.cxx
+++ b/sc/source/core/tool/interpr3.cxx
@@ -34,7 +34,6 @@
 #include <math.h>
 #include <vector>
 #include <algorithm>
-#include <boost/math/special_functions/log1p.hpp>
 #include <comphelper/random.hxx>
 
 using ::std::vector;
@@ -588,7 +587,7 @@ double ScInterpreter::GetGamma(double fZ)
 
     if (fZ >= -0.5) // shift to x>=1, might overflow
     {
-        double fLogTest = lcl_GetLogGammaHelper(fZ+2) - boost::math::log1p(fZ) - log( fabs(fZ));
+        double fLogTest = lcl_GetLogGammaHelper(fZ+2) - rtl::math::log1p(fZ) - log( fabs(fZ));
         if (fLogTest >= fLogDblMax)
         {
             SetError( FormulaError::IllegalFPOperation);
@@ -621,7 +620,7 @@ double ScInterpreter::GetLogGamma(double fZ)
         return log(lcl_GetGammaHelper(fZ));
     if (fZ >= 0.5)
         return log( lcl_GetGammaHelper(fZ+1) / fZ);
-    return lcl_GetLogGammaHelper(fZ+2) - boost::math::log1p(fZ) - log(fZ);
+    return lcl_GetLogGammaHelper(fZ+2) - rtl::math::log1p(fZ) - log(fZ);
 }
 
 double ScInterpreter::GetFDist(double x, double fF1, double fF2)