diff --git a/base/psblas/pdtreecomb.F b/base/psblas/pdtreecomb.F
index b95a5475..bb454e92 100644
--- a/base/psblas/pdtreecomb.F
+++ b/base/psblas/pdtreecomb.F
@@ -106,8 +106,8 @@ C
 #endif    
 *     ..
 *     .. External Functions ..
-      LOGICAL            LSAME
-      EXTERNAL           LSAME
+      LOGICAL            PSB_LSAME
+      EXTERNAL           PSB_LSAME
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC          MOD
@@ -133,8 +133,8 @@ C
 *
 *     Figure scope-dependant variables, or report illegal scope
 *
-      RSCOPE = LSAME( SCOPE, 'R' )
-      CSCOPE = LSAME( SCOPE, 'C' )
+      RSCOPE = PSB_LSAME( SCOPE, 'R' )
+      CSCOPE = PSB_LSAME( SCOPE, 'C' )
 *
       IF( RSCOPE ) THEN
          IF( BCAST ) THEN
@@ -152,7 +152,7 @@ C
          END IF
          NP = NPROW
          MYDIST = MOD( NPROW + MYROW - TRDEST, NPROW )
-      ELSE IF( LSAME( SCOPE, 'A' ) ) THEN
+      ELSE IF( PSB_LSAME( SCOPE, 'A' ) ) THEN
          NP = NPROW * NPCOL
          IAM = MYROW*NPCOL + MYCOL
          DEST = TRDEST*NPCOL + TCDEST
diff --git a/base/serial/Makefile b/base/serial/Makefile
index b5130cd2..4c8f94af 100644
--- a/base/serial/Makefile
+++ b/base/serial/Makefile
@@ -6,7 +6,7 @@ FOBJS = psb_cest.o psb_dcoins.o psb_dcsmm.o psb_dcsmv.o \
 	psb_dfixcoo.o psb_dipcoo2csr.o psb_dipcsr2coo.o psb_dneigh.o \
 	psb_dnumbmm.o psb_drwextd.o psb_dspgtdiag.o psb_dspgtblk.o \
 	psb_dspscal.o psb_dsymbmm.o psb_dtransp.o psb_dspclip.o psb_dspcnv.o\
-	psb_regen_mod.o psb_dipcoo2csc.o psb_dspgetrow.o lsame.o psb_zspgetrow.o\
+	psb_regen_mod.o psb_dipcoo2csc.o psb_dspgetrow.o psb_lsame.o psb_zspgetrow.o\
 	psb_zcsmm.o psb_zcsmv.o  psb_zspgtdiag.o psb_zspgtblk.o\
 	psb_zcsnmi.o psb_zcsrws.o psb_zcssm.o psb_zcssv.o psb_zspcnv.o\
 	psb_zfixcoo.o psb_zipcoo2csr.o psb_zipcsr2coo.o psb_zipcoo2csc.o \
diff --git a/base/serial/coo/dcoorws.f b/base/serial/coo/dcoorws.f
index ae2e03fb..eb49f132 100644
--- a/base/serial/coo/dcoorws.f
+++ b/base/serial/coo/dcoorws.f
@@ -41,11 +41,11 @@ C     .. Array Arguments ..
 C     .. Local scalars ..
       INTEGER I, J, NNZ, K
       DOUBLE PRECISION  SUM
-      logical lsame
-      external lsame
+      logical psb_lsame
+      external psb_lsame
 
       NNZ = INFOA(1)
-      IF (lsame(TRANS,'N')) THEN
+      IF (psb_lsame(TRANS,'N')) THEN
         DO I=1, M 
           ROWSUM(I) = 0.0D0
         ENDDO
@@ -66,7 +66,7 @@ C     .. Local scalars ..
           I = J 
         ENDDO
         
-      ELSE IF (lsame(TRANS,'T').OR.lsame(TRANS,'C')) THEN
+      ELSE IF (psb_lsame(TRANS,'T').OR.psb_lsame(TRANS,'C')) THEN
         DO J = 1, N
           ROWSUM(J) = 0.0D0
         ENDDO
diff --git a/base/serial/coo/zcoorws.f b/base/serial/coo/zcoorws.f
index d237cad2..e332e7b3 100644
--- a/base/serial/coo/zcoorws.f
+++ b/base/serial/coo/zcoorws.f
@@ -11,11 +11,11 @@ C     .. Array Arguments ..
 C     .. Local scalars ..
       INTEGER I, J, NNZ, K
       DOUBLE PRECISION  SUM
-      logical lsame
-      external lsame
+      logical psb_lsame
+      external psb_lsame
 
       NNZ = INFOA(1)
-      IF (lsame(TRANS,'N')) THEN
+      IF (psb_lsame(TRANS,'N')) THEN
         DO I=1, M 
           ROWSUM(I) = 0.0D0
         ENDDO
@@ -36,7 +36,7 @@ C     .. Local scalars ..
           I = J 
         ENDDO
         
-      ELSE IF (lsame(TRANS,'T').OR.lsame(TRANS,'C')) THEN
+      ELSE IF (psb_lsame(TRANS,'T').OR.psb_lsame(TRANS,'C')) THEN
         DO J = 1, N
           ROWSUM(J) = 0.0D0
         ENDDO
diff --git a/base/serial/f77/dgelp.f b/base/serial/f77/dgelp.f
index 1b88de1c..b21ef369 100644
--- a/base/serial/f77/dgelp.f
+++ b/base/serial/f77/dgelp.f
@@ -104,8 +104,8 @@ C     .. Local Arrays..
       INTEGER           INT_VAL
 C     .. Intrinsic Functions ..
       INTRINSIC         DBLE
-      logical     lsame
-      external    lsame
+      logical     psb_lsame
+      external    psb_lsame
 
       character*20      name
 c
@@ -118,8 +118,8 @@ C
       IERROR = 0
       CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
 
-      isnotran = lsame(trans,'N')
-      istran   = lsame(trans,'T') .or. lsame(trans,'C')
+      isnotran = psb_lsame(trans,'N')
+      istran   = psb_lsame(trans,'T') .or. psb_lsame(trans,'C')
       IF     (M.LT.0) THEN
          IERROR = 7
       ELSE IF(N.LT.0) THEN
diff --git a/base/serial/f77/zgelp.f b/base/serial/f77/zgelp.f
index 891b6c81..2ca382a1 100644
--- a/base/serial/f77/zgelp.f
+++ b/base/serial/f77/zgelp.f
@@ -104,8 +104,8 @@ C     .. Local Arrays..
       INTEGER           INT_VAL
 C     .. Intrinsic Functions ..
       INTRINSIC         DBLE
-      logical     lsame
-      external    lsame
+      logical     psb_lsame
+      external    psb_lsame
 
       character*20      name
 c
@@ -118,8 +118,8 @@ C
       IERROR = 0
       CALL FCPSB_ERRACTIONSAVE(ERR_ACT)
 
-      isnotran = lsame(trans,'N')
-      istran   = lsame(trans,'T') .or. lsame(trans,'C')
+      isnotran = psb_lsame(trans,'N')
+      istran   = psb_lsame(trans,'T') .or. psb_lsame(trans,'C')
       IF     (M.LT.0) THEN
          IERROR = 7
       ELSE IF(N.LT.0) THEN
diff --git a/base/serial/lsame.f90 b/base/serial/psb_lsame.f90
similarity index 94%
rename from base/serial/lsame.f90
rename to base/serial/psb_lsame.f90
index fe515d7f..0df2862f 100644
--- a/base/serial/lsame.f90
+++ b/base/serial/psb_lsame.f90
@@ -28,10 +28,10 @@
 !!$  POSSIBILITY OF SUCH DAMAGE.
 !!$ 
 !!$  
-function lsame(a,b)
+function psb_lsame(a,b)
   use psb_string_mod
-  logical :: lsame
+  logical :: psb_lsame
   character(len=1) :: a, b 
   
-  lsame = (tolower(a) == tolower(b))
-end function lsame
+  psb_lsame = (tolower(a) == tolower(b))
+end function psb_lsame