diff --git a/GNUmakefile b/GNUmakefile
index 0f8586c6..bd1eb5c8 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -38,8 +38,8 @@ MACPORTS_COMPILER := $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "macports")
 # Sun Studio 12.0 (0x0510) and 12.3 (0x0512)
 SUNCC_120_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[0-9]|5\.[2-9]|6\.)")
 SUNCC_122_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[1-9]|5\.[2-9]|6\.)")
-SUNCC_123_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[3-9]|5\.[2-9]|6\.)")
-SUNCC_124_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[4-9]|5\.[2-9]|6\.)")
+SUNCC_123_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[2-9]|5\.[2-9]|6\.)")
+SUNCC_124_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[3-9]|5\.[2-9]|6\.)")
 
 HAS_SOLIB_VERSION := $(IS_LINUX)