diff --git a/gb.gsl/src/c_gsl.c b/gb.gsl/src/c_gsl.c
index 5c0037865..a4d1ff272 100644
--- a/gb.gsl/src/c_gsl.c
+++ b/gb.gsl/src/c_gsl.c
@@ -374,23 +374,23 @@ GB_DESC CGslDesc[] =
     // Class Constants
     // Appears that GSL Macros cannot be used in GB_CONSTANT
     // So we must define them here ourselves.
-    //GB_CONSTANT("M_E", "f", "2.7182818284590"), 		  /* e 4523536028747135 */
-    //GB_CONSTANT("M_LOGE", "f", "1.44269504088896340735992468100"),	  /* LOG_E */
-    //GB_CONSTANT("M_LOG10E", "f", "0.43429448190325182765112891892"), 	  /* log_10 (e) */
-    //GB_CONSTANT("M_SQRT2", "f", "1.41421356237309504880168872421"),  	  /* sqrt(2) */
-    //GB_CONSTANT("M_SQRT1_2", "f", "0.70710678118654752440084436210"),       /* sqrt(1/2) */
-    //GB_CONSTANT("M_SQRT3", "f", "1.73205080756887729352744634151"),         /* sqrt(3) */
+    GB_CONSTANT("M_E", "f", "2.71828182845904523536028747135"),             /* e */
+    GB_CONSTANT("M_LOGE", "f", "1.44269504088896340735992468100"),	        /* LOG_E */
+    GB_CONSTANT("M_LOG10E", "f", "0.43429448190325182765112891892"), 	    /* log_10 (e) */
+    GB_CONSTANT("M_SQRT2", "f", "1.41421356237309504880168872421"),  	    /* sqrt(2) */
+    GB_CONSTANT("M_SQRT1_2", "f", "0.70710678118654752440084436210"),       /* sqrt(1/2) */
+    GB_CONSTANT("M_SQRT3", "f", "1.73205080756887729352744634151"),         /* sqrt(3) */
     GB_CONSTANT("M_PI", "f", "3.14159265358979323846264338328"),            /* pi */
-    //GB_CONSTANT("M_PI_2", "f", "1.57079632679489661923132169164"),          /* pi/2 */
-    //GB_CONSTANT("M_PI_4", "f", "0.78539816339744830961566084582"),          /* pi/4 */
-    //GB_CONSTANT("M_SQRTPI", "f", "1.77245385090551602729816748334"),        /* sqrt(pi) */
-    //GB_CONSTANT("M_2_SQRTPI", "f", "1.12837916709551257389615890312"),      /* 2/sqrt(pi) */
-    //GB_CONSTANT("M_1_PI", "f", "0.31830988618379067153776752675"),          /* 1/pi */
-    //GB_CONSTANT("M_2_PI", "f", "0.63661977236758134307553505349"),          /* 2/pi */
-    //GB_CONSTANT("M_LN10", "f", "2.30258509299404568401799145468"),          /* ln(10) */
-    //GB_CONSTANT("M_LN2", "f", "0.69314718055994530941723212146"),           /* ln(2) */
-    //GB_CONSTANT("M_LNPI", "f", "1.14472988584940017414342735135"),          /* ln(pi) */
-    //GB_CONSTANT("M_EULER", "f", "0.57721566490153286060651209008"),         /* Euler constant */
+    GB_CONSTANT("M_PI_2", "f", "1.57079632679489661923132169164"),          /* pi/2 */
+    GB_CONSTANT("M_PI_4", "f", "0.78539816339744830961566084582"),          /* pi/4 */
+    GB_CONSTANT("M_SQRTPI", "f", "1.77245385090551602729816748334"),        /* sqrt(pi) */
+    GB_CONSTANT("M_2_SQRTPI", "f", "1.12837916709551257389615890312"),      /* 2/sqrt(pi) */
+    GB_CONSTANT("M_1_PI", "f", "0.31830988618379067153776752675"),          /* 1/pi */
+    GB_CONSTANT("M_2_PI", "f", "0.63661977236758134307553505349"),          /* 2/pi */
+    GB_CONSTANT("M_LN10", "f", "2.30258509299404568401799145468"),          /* ln(10) */
+    GB_CONSTANT("M_LN2", "f", "0.69314718055994530941723212146"),           /* ln(2) */
+    GB_CONSTANT("M_LNPI", "f", "1.14472988584940017414342735135"),          /* ln(pi) */
+    GB_CONSTANT("M_EULER", "f", "0.57721566490153286060651209008"),         /* Euler constant */
 
     GB_END_DECLARE
 };